Cathy used
16 of the thread to tie some presents. She threw away
311 of the remaining thread. As a result, she had 260 cm of the thread left. How much thread did Cathy have at first? Give your answer in cm.
Fraction of the thread left after tying some presents
= 1 -
16=
56 Fraction of the remaining thread left after throwing away
= 1 -
311=
811
Fraction of the total thread left
=
56 ×
811=
2033
Length of the thread at first = 33 u
Length of the thread left = 20 u
20 u = 260
1 u = 260 ÷ 20 = 13
Length of the thread at first
= 33 u
= 33 x 13
= 429 cm
Answer(s): 429 cm