Jen used
38 of the ribbon to tie some presents. She threw away
79 of the remaining ribbon. As a result, she had 45 cm of the ribbon left. How much ribbon did Jen have at first? Give your answer in cm.
Fraction of the ribbon left after tying some presents
= 1 -
38=
58 Fraction of the remaining ribbon left after throwing away
= 1 -
79=
29
Fraction of the total ribbon left
=
58 ×
29=
536
Length of the ribbon at first = 36 u
Length of the ribbon left = 5 u
5 u = 45
1 u = 45 ÷ 5 = 9
Length of the ribbon at first
= 36 u
= 36 x 9
= 324 cm
Answer(s): 324 cm