Question

Abena invited 40 people to a party.

How many came if 25 % of those invited didn't come?
30
How many came if 20 % of those invited didn't come?

Answer 1

See below.

Explanation:

Part 1:

People who were invited and didn't come:

= 25% of 40

Key: "of" means "to multiply", % means out of 100.

`\displaystyle =(25)/(100) * 40\\\\= (25 * 4)/(10) \\\\=(100)/(10) \\\\= 10`

So,

People who came = 40 - 10

= 30 people

Part 2:

People who were invited but didn't come:

= 20% of 40

`\displaystyle =(20)/(100) * 40\\\\= (1)/(5) * 40\\\\= 1 * 8\\\\= 8`

So,

People who came = 40 - 8

= 32 people

`\rule[225]{225}{2}`