Jaslyn used
45 of the thread to tie some presents. She threw away
57 of the remaining thread. As a result, she had 20 cm of the thread left. How much thread did Jaslyn have at first? Give your answer in cm.
Fraction of the thread left after tying some presents
= 1 -
45=
15 Fraction of the remaining thread left after throwing away
= 1 -
57=
27
Fraction of the total thread left
=
15 ×
27=
235
Length of the thread at first = 35 u
Length of the thread left = 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Length of the thread at first
= 35 u
= 35 x 10
= 350 cm
Answer(s): 350 cm