Risa used
110 of the rope to tie some presents. She threw away
78 of the remaining rope. As a result, she had 27 cm of the rope left. How much rope did Risa have at first? Give your answer in cm.
Fraction of the rope left after tying some presents
= 1 -
110=
910 Fraction of the remaining rope left after throwing away
= 1 -
78=
18
Fraction of the total rope left
=
910 ×
18=
980
Length of the rope at first = 80 u
Length of the rope left = 9 u
9 u = 27
1 u = 27 ÷ 9 = 3
Length of the rope at first
= 80 u
= 80 x 3
= 240 cm
Answer(s): 240 cm