Question

solve this with correct explanation

Answer 1

let cost of 1 eraser=p
and cost of 1 pencil =q

then according to question

15p+25q=185.............(1)

and

again

9p+xq=106...............(2)

then from (1)

p=(185-25q)/15

substituting in 2 the value of p

9(185-25q)15+qx=106

3(37-5q)+qx=106

111-15q+qx=106

15q-qx=5

q(15-x)=5

q=5/(15-x)


it is clear that x can not be 15
for x=15 q is undefined

answer is 15

thanks


UDIT (^^♪

Answer 2

Hello dear your answer is 15



Thanks