Shiyun used
34 of the ribbon to tie some presents. She threw away
38 of the remaining ribbon. As a result, she had 25 cm of the ribbon left. How much ribbon did Shiyun have at first? Give your answer in cm.
Fraction of the ribbon left after tying some presents
= 1 -
34=
14 Fraction of the remaining ribbon left after throwing away
= 1 -
38=
58
Fraction of the total ribbon left
=
14 ×
58=
532
Length of the ribbon at first = 32 u
Length of the ribbon left = 5 u
5 u = 25
1 u = 25 ÷ 5 = 5
Length of the ribbon at first
= 32 u
= 32 x 5
= 160 cm
Answer(s): 160 cm