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Arithmetic Mcqs

Today is khadija’s birthday. After one year, she will become two times as she was ten years ago. current age of Khadija?

Arithmetic Mcqs, Basic Maths Mcqs, Mathematics Mcqs /
Today is khadija’s birthday. After one year, she will become two times as she was ten years ago. current age of Khadija?

A. 19
B. 20
C. 21
D. 22

let her age be x
after 1 year her age will be x+1=2(x-10)
x+1=2x-20
1+20=2x-x
x=21 years

Today is khadija’s birthday. After one year, she will become two times as she was ten years ago. current age of Khadija? Read More »

Arithmetic Mcqs, Basic Maths Mcqs, Mathematics Mcqs

If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is__________?

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs /
If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is__________?

A. 53.33
B. 54.68
C. 55
D. None of these
Required average = (55 x 50 + 60 x 55 + 45 x 60) / (55 + 60 + 45)
= (2750 + 3300 + 2700) /160
= 54.68 is correct Answer

If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is__________? Read More »

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs

The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is___________?

Arithmetic Mcqs, MCQs / Q&A /
The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is___________?

A. 17 kg
B. 20 kg
C. 26 kg
D. 31 kg
Let A, B, C represent their respective weights. Then, we have: A + B + C = (45 x 3) = 135 …. (i) A + B = (40 x 2) = 80 …. (ii) B + C = (43 x 2) = 86 ….(iii) Adding (ii) and (iii), we get: A + 2B + C = 166 …. (iv) Subtracting (i) from (iv), we get : B = 31. B’s weight = 31 kg

The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is___________? Read More »

Arithmetic Mcqs, MCQs / Q&A

The average of 18 observations was calculated and it was 124. Later on it was discovered that two observations 46 and 82 were incorrect. The correct values are 64 and 28. The correct average of 18 observations is___________?

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs /
The average of 18 observations was calculated and it was 124. Later on it was discovered that two observations 46 and 82 were incorrect. The correct values are 64 and 28. The correct average of 18 observations is___________?

A. 123
B. 137
C. 121
D. 122
Sum of 18 observations = 18×124 =2232
Correct sum of 18 observations = 2232-46-82+64+28
= 2196
Therefore, Correct average =2196/18 = 122

The average of 18 observations was calculated and it was 124. Later on it was discovered that two observations 46 and 82 were incorrect. The correct values are 64 and 28. The correct average of 18 observations is___________? Read More »

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs

A person travels from x to y at a speed of 40Km/h and returns by increasing his speed 50%. What is his average speed for both the trips?

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs /
A person travels from x to y at a speed of 40Km/h and returns by increasing his speed 50%. What is his average speed for both the trips?

A. 36km/h
B. 45km/h
C. 48km/h
D. 50km/h
Explanation:
Speed of person from x to y =40 km/h
Speed of person from y to x =(40×150)/100 = 60km/h
Since the distance travelled is same
Therefore, Average Speed = (2x40x60)/40+60 = 48km/h

A person travels from x to y at a speed of 40Km/h and returns by increasing his speed 50%. What is his average speed for both the trips? Read More »

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs

The mean marks of 30 students in a class is 58.5. Later on it was found that 75 was wrongly recorded as 57. Find the correct them.

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs /
The mean marks of 30 students in a class is 58.5. Later on it was found that 75 was wrongly recorded as 57. Find the correct them.

A. 57.4
B. 57.5
C. 58.9
D. 59.1
Correct mean = 30x 58.5 -57 +75/30
= 1755+18/30 = 1773/30 = 59.1

The mean marks of 30 students in a class is 58.5. Later on it was found that 75 was wrongly recorded as 57. Find the correct them. Read More »

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs

The average of women and child workers in a factory was 15%yr. The average age of all the 16 children was 8yr and average age of women workers was 22 yrs if ten women workers were married then the number of unmarried women workers were________?

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs /
The average of women and child workers in a factory was 15%yr. The average age of all the 16 children was 8yr and average age of women workers was 22 yrs if ten women workers were married then the number of unmarried women workers were________?

A. 16
B. 12
C. 8
D. 6
Let the number of women workers be x
According to the question 22*x+16*8 = 15(16+x)
=> 22x+128 =240 +15x
=> 22x-15x = 240 -128
=> 7x=112
Therefore, x=112/7 =16
Therefore, Unmarried women workers =(16-10) = 6

The average of women and child workers in a factory was 15%yr. The average age of all the 16 children was 8yr and average age of women workers was 22 yrs if ten women workers were married then the number of unmarried women workers were________? Read More »

Arithmetic Mcqs, Average Mcqs, Basic Maths Mcqs, Mathematics Mcqs