1)The least perfect square, which is divisible by each of 21, 36 and 66 is:
A. 213444
B. 214344
C. 214434
D. 231444
Answer:A. 213444
Explanation:
L.C.M. of 21, 36, 66 = 2772.
Now, 2772 = 2 x 2 x 3 x 3 x 7 x 11
To make it a perfect square, it must be multiplied by 7 x 11.
So, required number = 22 x 32 x 72 x 112 = 213444
2) A group of students decided to collect as many paise from each member of group as is the number of members. If the total collection amounts to Rs. 59.29, the number of the member is the group is:
A. 57
B. 67
C. 77
D. 87
Answer:C. 77
Explanation:
collection = (59.29 x 100) = 5929
members = √5929 = 77.
3) √0.0169 x ? = 1.3<
A. 10
B. 100
C. 1000
D. None of these
Answer:B. 100
Explanation:
Let √0.0169 x x = 1.3.
Then, 0.0169x = (1.3)2 = 1.69