Nora used
35 of the thread to tie some presents. She threw away
310 of the remaining thread. As a result, she had 70 cm of the thread left. How much thread did Nora have at first? Give your answer in cm.
Fraction of the thread left after tying some presents
= 1 -
35=
25 Fraction of the remaining thread left after throwing away
= 1 -
310=
710
Fraction of the total thread left
=
25 ×
710=
725
Length of the thread at first = 25 u
Length of the thread left = 7 u
7 u = 70
1 u = 70 ÷ 7 = 10
Length of the thread at first
= 25 u
= 25 x 10
= 250 cm
Answer(s): 250 cm