Shannon used
35 of the rope to tie some presents. She threw away
47 of the remaining rope. As a result, she had 90 cm of the rope left. How much rope did Shannon have at first? Give your answer in cm.
Fraction of the rope left after tying some presents
= 1 -
35=
25 Fraction of the remaining rope left after throwing away
= 1 -
47=
37
Fraction of the total rope left
=
25 ×
37=
635
Length of the rope at first = 35 u
Length of the rope left = 6 u
6 u = 90
1 u = 90 ÷ 6 = 15
Length of the rope at first
= 35 u
= 35 x 15
= 525 cm
Answer(s): 525 cm