Diana used
16 of the ribbon to tie some presents. She threw away
47 of the remaining ribbon. As a result, she had 100 cm of the ribbon left. How much ribbon did Diana 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 -
47=
37
Fraction of the total ribbon left
=
56 ×
37=
514
Length of the ribbon at first = 14 u
Length of the ribbon left = 5 u
5 u = 100
1 u = 100 ÷ 5 = 20
Length of the ribbon at first
= 14 u
= 14 x 20
= 280 cm
Answer(s): 280 cm