hope to get help for this qn

on the same day rachel started working on the qns of the book maths p6 bk 1 while larry works on the qns on the book exciting math bk1.if rachel finishes 16 qns a day while larry completes 4 qns a day , 710 qns will be left for rachel by the time larry does all his qns .if larry completes 16 qns a day while rachel does 8 qns a day 910 qns will be left in exciting maths bk 1 left for rachel . find the no.p of qns in each book .
thanks