Sue spent half of her money on a book.

Then she spent $1.25 on a pen.

She has $3.20 left.

How much did she start with?

Question

Mathematics

Steven Gutierrez

14 January, 10:20

Sue spent half of her money on a book.

Then she spent $1.25 on a pen.

She has $3.20 left.

How much did she start with?

+4

Answers (1)

Know the Answer?

Abby Foley · Answer 1

She started with 8.90

Step-by-step explanation:

Let m = money

She spent 1/2 on a book

m - 1/2 m

This is what she has left after buying her book

Now she buys a pen at 1.25

m-1/2m - 1.25

This is how much she has left after buying the pen

The problem states that she has 3.20 left

3.20 = m-1/2m - 1.25

Combine like terms

3.20 = 1/2 m - 1.25

Add 1.25 to each side

3.2+1.25 = 1/2m - 1.25 + 1.25

4.45 = 1/2m

Multiply by 2

2*4.45 = 1/2m*2

8.90 = m

She started with 8.90

Sue spent half of her money on a book.Then she spent $1.25 on a pen.She has $3.20 left.How much did she start with?

Sue spent half of her money on a book.

Then she spent $1.25 on a pen.

She has $3.20 left.

How much did she start with?