Of the 15-year-olds at a karate school, 6 have black belts and 20 have brown belts. Among the 16-year-olds, 5 have black belts and 9 have brown belts. Which age group has a higher ratio of black belts to brown belts?

What is the area of a triangle with a base of 4.24 and hight of 3?

A tee-ball team for 5 year-olds has half as many girls as boys. If there are 15 children on the team, how many are boys and how many are girls?

It takes 41.7 Btus to heat a 5 gallon jug of water. What is the density of a gallon of water?

Mike took a taxi from his home to the airport. The taxi driver charged an initial fee of $6 plus $3 per mile. The total fare was $24, not including the tip. How many miles did Mike travel

this box holds cereal. how many cubic inches of cereal can it hold the size of the box is 6 in, 2 in, 12 in

A group of bike riders took a 4.0 hour trip. during the first 3.0 hours, they traveled a total of 50. kilometers, but during the last hour, they traveled only 10. kilometers. what was the group's average speed for the entire trip?

The product of a number and negative 16 is 64

Mark and his brother signed up for the Catch Up phone plan. They share the minutes every month equally. How many minutes can Mark use each day without going over his share of minutes?

Choose the converse of the following statement. They are not left behind, if they are on time. If they are not left behind, then they are on time. If they are on time, then they are not left behind. If they are not on time, then they are left behind.

An airplane flies 105 miles in ½ hour. How far can it fly in 1 ¼ hours at the same rate of speed?