THE COST OF 5 PENCILS IS 9 DOLLAR. HOW MUCH DOES TOM HAVE...

exercise 7. - DE KIEM TRA THANG 8 LOP 51
DE KIEM TRA THANG 8 LOP 51
Exercise 7. The cost of 5 pencils is 9 dollar. How much does Tom have to pay for 10 pencils? Answer: …………..dollar.