Cindy used
411 of the thread to tie some presents. She threw away
57 of the remaining thread. As a result, she had 40 cm of the thread left. How much thread did Cindy have at first? Give your answer in cm.
Fraction of the thread left after tying some presents
= 1 -
411=
711 Fraction of the remaining thread left after throwing away
= 1 -
57=
27
Fraction of the total thread left
=
711 ×
27=
211
Length of the thread at first = 11 u
Length of the thread left = 2 u
2 u = 40
1 u = 40 ÷ 2 = 20
Length of the thread at first
= 11 u
= 11 x 20
= 220 cm
Answer(s): 220 cm