Olivia used
49 of the thread to tie some presents. She threw away
78 of the remaining thread. As a result, she had 55 cm of the thread left. How much thread did Olivia have at first? Give your answer in cm.
Fraction of the thread left after tying some presents
= 1 -
49=
59 Fraction of the remaining thread left after throwing away
= 1 -
78=
18
Fraction of the total thread left
=
59 ×
18=
572
Length of the thread at first = 72 u
Length of the thread left = 5 u
5 u = 55
1 u = 55 ÷ 5 = 11
Length of the thread at first
= 72 u
= 72 x 11
= 792 cm
Answer(s): 792 cm