Show how many

This task is about solving problems involving rates and ratios.
a)
Mara has 4 books for every 3 books Chloe has. Chloe has 12 books. Show how to work out how many books Mara has.
 
 
 
 
 
 
 
 
Mara has _____ books
b)
Sam gets $15 every 5 weeks for doing work around the house. Show how to work out how many weeks it will take Sam to save $60.
 
 
 
 
 
 
 
 
It takes Sam _____ weeks
c)
There are 6 boys for every 4 girls in a hockey team. There are 10 girls in the team. Show how to work out how many boys are in the team.
 
 
 
 
 
 
 
 
The team has _____ boys