There are $10$ boys and $15$ girls in a class. The teacher wants to divide the children into groups such that each group contains an equal number of boys and girls. What is the greatest number of groups that she can make like this$?$

The total number of factors of 1156 is: 

(A) 9 

(B) 8 

(C) 10 

(D) 11 

What is the number of Prime factor in ${15}^{18}$$\times$$4^{10}$$\times$$6^9$.

The prime factorisation of 240 is:

(A) $2^3\times$$3^2\times 5$ 

(B) $2^4\times 3^2\times 5$

(C) $2^4\times 3\times 5$

(D) $2^5\times 3\times 5$

The sum of all the factors of $156$ is: 
(A) $392$
(B) $235$
(C) $390$
(D) $379$