the total cost of 12 pens and 15 books is 202.50$.the average cost of 12 pens is 3.50$.what is the average cost of 15 books??
Answers
Answered by
4
Answer:
hcfyxutxtexyrxyrcrxufcfzufcurxd drr5syctzx
Answered by
12
Step-by-step explanation:
total cost of 12 pens and 15 books is 202.50$
Average cost of 15 books is 3.50$
let the cost of one pen be x and one book be y
12 x+15 y = 202.50$
3.50 $ = x/12
x= 12×3.50$
x= 39$
cost of 12 pens is 39 $
cost of 15 books = 202.50$- cost of 12 pens
= 202.50$-39
= 163.50$
cost of 15 books is 163.50$
average cost of 15 books = 163.50$ /15
= 10.23 $
Similar questions