Least perfect square number, exactly divisible by 21, 36 and 56 is_________?
Least perfect square number, exactly divisible by 21, 36 and 56 is_________?
A. 3600
B. 504
C. 441
D. 7056
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A and B can together do a piece of work in 15 days. B alone can do it in 20 days. In how many days can A alone do it ?
A and B can together do a piece of work in 15 days. B alone can do it in 20 days. In how many days can A alone do it ?A. 40 days
B. 50 days
C. 60 days
D. 70 days
(A+B)’S 1 day’s work = [1/15−1/20]=1/60
A alone can finish it in 60 daysA bag contains five white and four red balls. Two balls are picked at random from the bag. What is the probability that they both are different color?
A bag contains five white and four red balls. Two balls are picked at random from the bag. What is the probability that they both are different color?A. 4/9
B. 5/9
C. 7/9
D. 8/9
Explanation:
Two balls can be picked from nine balls in ⁹C₂ ways.
We select one white ball and one red ball from five white balls and four red balls. This can be done ⁵C₁ . ⁴C₁ ways.
The required probability = (5 * 4)/⁹C₂ = 20/36 = 5/9A started a business with an investment of Rs. 70000 and after 6 months B joined him investing Rs. 120000. If the profit at the end of a year is Rs. 52000, then the share of B is?
A started a business with an investment of Rs. 70000 and after 6 months B joined him investing Rs. 120000. If the profit at the end of a year is Rs. 52000, then the of B is?A. Rs. 28000
B. Rs. 24000
C. Rs. 30000
D. Rs. 26000
E. None of these
Explanation:
Ratio of investments of A and B is (70000 * 12) : (120000 * 6) = 7 : 6
Total profit = Rs. 52000
of B = 6/13 (52000) = Rs. 24000Two numbers are 30% and 37% are less than a third number .How much percent is the second number less than the first?
Two numbers are 30% and 37% are less than a third number .How much percent is the second number less than the first?A. 15%
B. 12%
C. 10%
D. 5%A rectangular farm has to be fenced one long side, one short side and the diagonal. If the cost of fencing is Rs.10 per meter. The area of farm is 1200 m2 and the short side is 30 m long. How much would the job cost?
A rectangular farm has to be fenced one long side, one short side and the diagonal. If the cost of fencing is Rs.10 per meter. The area of farm is 1200 m2 and the short side is 30 m long. How much would the job cost?A. Rs.700
B. Rs.1200
C. Rs.1400
D. Rs.1500Two numbers 4242 and 2903 when divided by a certain number of three digits, leave the same remainder. Find the number?
Two numbers 4242 and 2903 when divided by a certain number of three digits, leave the same remainder. Find the number?A. 101
B. 103
C. 107
D. 113