Mary used
16 of the ribbon to tie some presents. She threw away
67 of the remaining ribbon. As a result, she had 15 cm of the ribbon left. How much ribbon did Mary 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 -
67=
17
Fraction of the total ribbon left
=
56 ×
17=
542
Length of the ribbon at first = 42 u
Length of the ribbon left = 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Length of the ribbon at first
= 42 u
= 42 x 3
= 126 cm
Answer(s): 126 cm
