Question

Roberto buys 15 balls for 300. how much will you pay for 10 balls?​

Answer 1

$200 (or whatever the currency is since it is not specified here)

Explanation:

We can create a proportion for this

$300/15 balls = $x/10 balls

Cross-multiplication: 15x = 3000

Divide: x = $200

Answer 2

200

Explanation:

300/15

divide cost by number bought

20

you will get this number, so for 1 ball you will pay 20

20 x 10

you will take the price for one ball and multiply it by the number of balls you want to buy

200

you will have to pay this number for 10 balls