Converting Whole Ratios To Part Ratios

This lesson covers:

  1. How to convert 'part : whole' ratios into 'part : part' ratios
  2. How to scale up 'part : part' ratios

Carly keeps both rabbits and cats as pets. The ratio of rabbits to the total number of pets is 3 : 7.


If she has 3 rabbits, how many cats must she have? 

4

0

/

1

Bob collects both scarves and hats so that the ratio of scarves to the total number of items of clothing is 5 : 8.


If he has 15 scarves, how many hats must he have? 

9

0

/

1

The ratio of boys to the total number of students in school is 7 : 15.

If there are 350 boys in school, how many girls must there be? 

400

0

/

1

The ratio of boys to the total number of students in school is 6 : 11.

If there are 385 students in the school, how many girls must there be? 

175

0

/

1