They are 3 boys and 5 girls standing at the entrance to the school fair. each child is holding 3 balloons. one sixth of the balloons are red. there are twice as many green balloons as red ones. the rest are blue.

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

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?