[B].
[C].
[D].
Answer: Option C
Explanation:
Since the numbers are co-prime, they contain only 1 as the common factor.
Also, the given two products have the middle number in common.
So, middle number = H.C.F. of 551 and 1073 = 29;
| First number = | 551 | = 19; Third number = | 1073 | = 37. | ||||
| 29 | 29 |
Required sum = (19 + 29 + 37) = 85.
[B].
[C].
[D].
Answer: Option A
Explanation:
Let the ages of children be x, (x + 3), (x + 6), (x + 9) and (x + 12) years.
Then, x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 50
5x = 20
x = 4.
Age of the youngest child = x = 4 years.
[B].
[C].
[D].
Answer: Option D
Explanation:
L.C.M. of 2, 4, 6, 8, 10, 12 is 120.
So, the bells will toll together after every 120 seconds(2 minutes).
| In 30 minutes, they will toll together | 30 | + 1 = 16 times. |
| 2 |
A. 1.5km/hr
B. 3km/hr
C. 1km/hr
D. none
Explanation:
Let the speed of stream be x km/hr
Speed upstream = (2-x) km/hr = 2-x = 1 => x = 1 km/hr
[B].
[C].
[D].
35
Answer: Option B
Explanation:
| (7 + 35)(7 – 35) | = | (7)2 – (35)2 | = 49 – 45 = 4 = 2. |
A. Rs.10
B. Rs.2
C. Rs.5
D. Rs.3
Explanation:
1250 = D(100/4)2
D = 2