Question

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A coffee shop sells bags of coffee for a regular price of $7 per bag. John bought some bags and used a coupon for $15 off his entire purchase. After applying the coupon, he paid $20. How many bags of coffee did he buy?

(a) Write an equation to help answer the question above.
Choose the correct form below and fill in the blanks using only 7, 15, and 20.
(The variable x is used to represent the number of bags.)
_x+_=_
or
_x-_=_
(b) Write an expression to help answer the question above.
Choose the correct form below and fill in the blanks using only 7, 15, and 20.
_+_
_
or
_-_
_
(c) How many bags of coffee did John buy?
_bags

Answer 1

Let the entire purchase amount be the number of bags he bought, B, times the price per bag

So B*8 = the entire purchase price

From this ...he subtracts 10 and pays 30

So we have this

B*8 - 10 = 30 add 10 to both sides

B*8 = 40 divide both sides by 8

B = 5 bags

Answer 2

a.) 7x-15=20

b.) 35-15

c.) he bought 5 bags