Irene used
18 of the ribbon to tie some presents. She threw away
311 of the remaining ribbon. As a result, she had 126 cm of the ribbon left. How much ribbon did Irene have at first? Give your answer in cm.
Fraction of the ribbon left after tying some presents
= 1 -
18=
78 Fraction of the remaining ribbon left after throwing away
= 1 -
311=
811
Fraction of the total ribbon left
=
78 ×
811=
711
Length of the ribbon at first = 11 u
Length of the ribbon left = 7 u
7 u = 126
1 u = 126 ÷ 7 = 18
Length of the ribbon at first
= 11 u
= 11 x 18
= 198 cm
Answer(s): 198 cm