Ratio & Rate Problems

The ratio of boys to girls is 3 to 2. If there are 12 boys, how many girls are there?

It takes one Super Giant Pizza to feed 3 people. If you invite 36 people, how many pizzas will you need?

At a recent party, it cost $9.50 for refreshments for 10 guests. At this rate, how much would it cost to have refreshments for 80 guests?

Mary has saved $17.50 in the past 3 weeks. At this rate, how much will she save in 15 weeks?

Mr. Johnson was paid $190 for a job that required 40 hours of work. At this rate, how much should he be paid for a job requiring 60 hours of work?

The park ranger stocks the children’s fishing pond keeping a ratio of 4 sunfish to 3 perch. If he puts 300 sunfish into the pond, how many perch should be put into the pond?

If two pounds of meat will serve 5 people, how many pounds will be needed to serve 20 people?

Jack was planting a tree. He was to dig a hole that was 3 feet deep for every 5 feet of tree height. How deep should he dig the hole for a tree that is 55 feet high?

A certain shade of green paint is made from 4 parts yellow mixed with three parts blue. If 2 cans of yellow are used, how many cans of blue should be used?

If a 4-pound roast takes 200 minutes to cook, how long should a five-pound roast take?