Diana used
25 of the string to tie some presents. She threw away
37 of the remaining string. As a result, she had 240 cm of the string left. How much string did Diana have at first? Give your answer in cm.
Fraction of the string left after tying some presents
= 1 -
25=
35 Fraction of the remaining string left after throwing away
= 1 -
37=
47
Fraction of the total string left
=
35 ×
47=
1235
Length of the string at first = 35 u
Length of the string left = 12 u
12 u = 240
1 u = 240 ÷ 12 = 20
Length of the string at first
= 35 u
= 35 x 20
= 700 cm
Answer(s): 700 cm