The mass of the body at the center of the Earth is ____.

If three number are $2a$, $5a$ and $7a$, what will their LCM?

(A) $70a$
(B) $65a$
(C) $75a$
(D) $70a^3$

The product of two whole numbers are $1500$and their HCF is $10$. Find the LCM.

(A) $15000$
(B) $150$
(C) $1500$
(D) $15$

What is the value of $\sqrt{7921}$?

(A) $89$
(B) $87$
(C) $37$
(D) $47$

The average of $11$result is $60$. If the average of first six results is $58$ and that of last six is $63$. Find the $6th$ result.

(A) $66$
(B) $55$
(C) $64$
(D) $68$

$\sqrt[4]{{625}^3}= ?$ 

(A) $\sqrt[3]{1875}$
(B) $25$
(C) $125$
(D) None of these

The fraction equivalent to $\frac{2}{5}\%$ is:

Find the number that should replace '?'.

$\frac{(180\% of ?)}{2}=540$

(A) $400$
(B) $480$
(C) $560$
(D) $600$

A box is bought for $Rs.75$ and sold at a gain of $8\%$. Find its selling price.

(A) $81$
(B) $82$
(C) $89$
(D) $86$