Xuan used
16 of the string to tie some presents. She threw away
57 of the remaining string. As a result, she had 25 cm of the string left. How much string did Xuan have at first? Give your answer in cm.
Fraction of the string left after tying some presents
= 1 -
16=
56 Fraction of the remaining string left after throwing away
= 1 -
57=
27
Fraction of the total string left
=
56 ×
27=
521
Length of the string at first = 21 u
Length of the string left = 5 u
5 u = 25
1 u = 25 ÷ 5 = 5
Length of the string at first
= 21 u
= 21 x 5
= 105 cm
Answer(s): 105 cm