How to change a number into a percent

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?

Choose the correct translation for the following statement. it is at most ten. x< 10 x< 10 x> 10 x> 10

Match the one-to-one functions with the graphs of their inverse functions.