gsr wrote:

If 12 boys and 16 girls can do a work in 5 days and 13 boys and 24 girls can do it in 4 days,

1) Days required for 7 boys and 10 girls to complete the work.

2) Time required by you to answer this 'work' problem.

Answer choices for (1)

(A) 8.11

(B) 8.33

(C) 9.11

(D) 9.33

(E) None of the above

Your 2 mins starts now....

ok,in order not to be complainted later, i post my explanation as well

Let x, y be the work/ day done by a boy and a girl respectively

have: 12x+16y= 1/5 and 13x+24y=1/4

find x, y and substitute into the equation: 7x+10y=?

get the result= 24/200 ---> the days require blah blah is 200/24= 8.333333