Kathy used
25 of the ribbon to tie some presents. She threw away
58 of the remaining ribbon. As a result, she had 135 cm of the ribbon left. How much ribbon did Kathy have at first? Give your answer in cm.
Fraction of the ribbon left after tying some presents
= 1 -
25=
35 Fraction of the remaining ribbon left after throwing away
= 1 -
58=
38
Fraction of the total ribbon left
=
35 ×
38=
940
Length of the ribbon at first = 40 u
Length of the ribbon left = 9 u
9 u = 135
1 u = 135 ÷ 9 = 15
Length of the ribbon at first
= 40 u
= 40 x 15
= 600 cm
Answer(s): 600 cm