Numbers
6.
How many numbers less than 1000 are multiples of both 10 and 13 ?
Answer: Option D

Explanation: The number of multiples of 130 are obtained by dividing 1000 by 130. The quotient, ie 7 gives the result.

7.
A Classroom has equal number of boys and girls. Eight girls left to play kho-kho, leaving twice as many boys as girls in the classroom. What was the total number of girls and boys present initially?
Answer: Option D

Explanation: Let the number of boys and girls initially each be equal to x.

then 2(x-8) = x - 8

or, 2x-16 = x

or, x = 16

Total no of boys and girls initially present = 2x = 2 X 16 = 32.

8.
If 'a' is natural number. then the largest number dividing (a^{3} - a) is ?
Answer: Option D

Explanation: (2^{3} - 2) = 6 is the largest natural number that divides (a^{3} - a) for every number a.

9.
944 - 307 + 119 = ? + (16)^{2} ?
Answer: Option B

Explanation: 1063 - 307 = ? + 225

756 - ? + 256

? = 756 - 256 = 500

10.
879 X 439 + 879 X 321 = ?
A.
668040 B.
669040 C.
667030 D.
666040

Answer: Option A

Explanation: Given expression

879 X 439 + 879 X 321 = ?

? = 879 (439 + 321)

879 X 760 = 668040

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