Vanessa used
16 of the ribbon to tie some presents. She threw away
57 of the remaining ribbon. As a result, she had 80 cm of the ribbon left. How much ribbon did Vanessa have at first? Give your answer in cm.
Fraction of the ribbon left after tying some presents
= 1 -
16=
56 Fraction of the remaining ribbon left after throwing away
= 1 -
57=
27
Fraction of the total ribbon left
=
56 ×
27=
521
Length of the ribbon at first = 21 u
Length of the ribbon left = 5 u
5 u = 80
1 u = 80 ÷ 5 = 16
Length of the ribbon at first
= 21 u
= 21 x 16
= 336 cm
Answer(s): 336 cm