Ivan had $10 and spent 1/5 of it on cupcakes. He then spent some money on a milkshake and had only $3 left. How much is the milkshake?
Please answer and provide answer explanation.
5
Ivan spent a total of $10 - $3 = $7 on cupcakes and a milkshake.

The cost of the cupcake is $10 x 1 / 5 = $2.

So, $7 - $2 = $5 was spent on the milkshake.

.

The answer: 5