Students at Lincoln Middle School sell gift wrap to raise money for students activities the school keeps 40% of sells how many dollars worth of gift wrap must be sold to make $1,000

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?