Roshel used
38 of the ribbon to tie some presents. She threw away
67 of the remaining ribbon. As a result, she had 100 cm of the ribbon left. How much ribbon did Roshel have at first? Give your answer in cm.
Fraction of the ribbon left after tying some presents
= 1 -
38=
58 Fraction of the remaining ribbon left after throwing away
= 1 -
67=
17
Fraction of the total ribbon left
=
58 ×
17=
556
Length of the ribbon at first = 56 u
Length of the ribbon left = 5 u
5 u = 100
1 u = 100 ÷ 5 = 20
Length of the ribbon at first
= 56 u
= 56 x 20
= 1120 cm
Answer(s): 1120 cm