Erika used
15 of the streamer to tie some presents. She threw away
56 of the remaining streamer. As a result, she had 40 cm of the streamer left. How much streamer did Erika have at first? Give your answer in cm.
Fraction of the streamer left after tying some presents
= 1 -
15=
45 Fraction of the remaining streamer left after throwing away
= 1 -
56=
16
Fraction of the total streamer left
=
45 ×
16=
215
Length of the streamer at first = 15 u
Length of the streamer left = 2 u
2 u = 40
1 u = 40 ÷ 2 = 20
Length of the streamer at first
= 15 u
= 15 x 20
= 300 cm
Answer(s): 300 cm