Erika used a total of 5 blue ribbons and white ribbons. Each blue ribbon was 4 m long. Each white ribbon was 5 m long. The total length of ribbons she used was 23 m. How many white ribbons did she use?
If all the ribbons are blue,
total length of ribbons
= 5 x 5
= 25 m
Difference between the length of 1 blue ribbon and 1 white ribbon
= 5 - 4
= 1
Difference between the length of all the blue ribbons and all the white ribbons
= 25 - 23
= 2 m
Number of blue ribbons
= 2 ÷ 1
= 2
Number of white ribbons
= 5 - 2
= 3
Answer(s): 3
