Question by Huỳnh Anh Phương - Discuss with MathYouLike

Huỳnh Anh Phương

11/02/2019 at 08:34

8 notebooks costs $16.80, 5 pens costs $15.25. Anna buys 4 notebooks and 8 pens, Benny buys 5 notebooks and 10 pens. All 2 gives the shopkeeper 2 $20 notes. Who recived more money and recived more than how much money?

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List of answers

FacuFeri 23/02/2019 at 12:39

Conandtb spam
Nguyễn Mạnh Hùng 16/02/2019 at 13:23

A notebook costs: 16.80 : 8 = 2.10 ($)

A pen costs: 15.25 : 5 = 3.05 ($)

Anna buys: 2.10 x 4 + 3.05 x 8 = 8.40 + 24.40 = 32.80 ($)

Anna received: 2 x 20 - 32.80 = 7.20 ($)

Benny buys: 5 x 2.10 + 10 x 3.05 = 10.50 + 30.50 = 41 ($)

Benny received: 2 x 20 - 41 = -1 ($)

=> Anna received more and more than: 7.20 + 1 = 8.20 ($)
Conandtb 21/02/2019 at 14:21

A notebook costs: 16.80 : 8 = 2.10 ($)

A pen costs: 15.25 : 5 = 3.05 ($)

Anna buys: 2.10 x 4 + 3.05 x 8 = 8.40 + 24.40 = 32.80 ($)

Anna received: 2 x 20 - 32.80 = 7.20 ($)

Benny buys: 5 x 2.10 + 10 x 3.05 = 10.50 + 30.50 = 41 ($)

Benny received: 2 x 20 - 41 = -1 ($)

=> Anna received more and more than: 7.20 + 1 = 8.20 ($)

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