Lucy used
47 of the string to tie some presents. She threw away
34 of the remaining string. As a result, she had 18 cm of the string left. How much string did Lucy have at first? Give your answer in cm.
Fraction of the string left after tying some presents
= 1 -
47=
37 Fraction of the remaining string left after throwing away
= 1 -
34=
14
Fraction of the total string left
=
37 ×
14=
328
Length of the string at first = 28 u
Length of the string left = 3 u
3 u = 18
1 u = 18 ÷ 3 = 6
Length of the string at first
= 28 u
= 28 x 6
= 168 cm
Answer(s): 168 cm