Sam is packing gift boxes with fruit. For each apple he packs 3 plums and 5 oranges. If he puts 3 apples in a box, how many plums and Oranges will Sam put on the box?

You can make an equation.

Let x=oranges
p=plums
n=apples

n= 3p + 5x

So basically we know 1 Apple means Sam will pack 3 plums and 5 oranges

To get 3n which means 3 apples we have to multiply the whole equation by 3

(n= 3p + 5x) x3

3n=9p+15x

So Sam will also put 9 plums and 15 oranges if he puts 3 apples in the box

The correct answer is -20y