Question

A school needs 25 butterfly breeding kits, and places an order with an educational company. They already have 7 kits, and they receive a box with x kits, but still need 3 more kits. Write the equation that you can use to find out how many kits are in the box.

Answer 1

25 - 7 = 18 | 18 - 3 = 15 The school received 15 kits in the box. The reason why is because there are 3 kits that they haven't received yet. Then there were 7 that they already had, so that means there are 10 kits that wont be included in the box.

Answer 2

You can write an equation like this:

7 + x = 25 - 3

The amount they have (7) plus the amount they received (x) is 3 less than the amount they need (25). It simplifies to:

7 + x = 22

To solve, isolate the variable by subtracting 7 from each side:

x = 15

The box contained 15 kits.