Rachel used
38 of the thread to tie some presents. She threw away
78 of the remaining thread. As a result, she had 85 cm of the thread left. How much thread did Rachel have at first? Give your answer in cm.
Fraction of the thread left after tying some presents
= 1 -
38=
58 Fraction of the remaining thread left after throwing away
= 1 -
78=
18
Fraction of the total thread left
=
58 ×
18=
564
Length of the thread at first = 64 u
Length of the thread left = 5 u
5 u = 85
1 u = 85 ÷ 5 = 17
Length of the thread at first
= 64 u
= 64 x 17
= 1088 cm
Answer(s): 1088 cm