Question

Trey went to the batting cages to practise hitting. He rented a helmet for $4.00 and paid $0.75 for each group of 20 pitches. If he spent a total of$7.00 at the batting cages, how many groups of pitches did he pay for?

Answer 1

He paid for 4 groups of pitches.

Explanation:

This can be solved by writing an equation and solving it, or we can just work it out step by step.

Trey spent `$7` in total, `4` of which was for renting a helmet.

He spent `$7 - $4 = $3` on pitches at `0.75` for a group.

The number of groups of pitches is: `" "3 div $0.75`

`3 div $0.75 = 4":` groups
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Using algebra:

Let the number of groups be `x`.

`0.75x + 4 = 7`

`0.75x =7-4`

`0.75x = 3`

`x = 3/0.75`

`x =4`