Betty used
15 of the ribbon to tie some presents. She threw away
35 of the remaining ribbon. As a result, she had 64 cm of the ribbon left. How much ribbon did Betty have at first? Give your answer in cm.
Fraction of the ribbon left after tying some presents
= 1 -
15=
45 Fraction of the remaining ribbon left after throwing away
= 1 -
35=
25
Fraction of the total ribbon left
=
45 ×
25=
825
Length of the ribbon at first = 25 u
Length of the ribbon left = 8 u
8 u = 64
1 u = 64 ÷ 8 = 8
Length of the ribbon at first
= 25 u
= 25 x 8
= 200 cm
Answer(s): 200 cm