Kathy used
16 of the string to tie some presents. She threw away
37 of the remaining string. As a result, she had 100 cm of the string left. How much string did Kathy 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 -
37=
47
Fraction of the total string left
=
56 ×
47=
1021
Length of the string at first = 21 u
Length of the string left = 10 u
10 u = 100
1 u = 100 ÷ 10 = 10
Length of the string at first
= 21 u
= 21 x 10
= 210 cm
Answer(s): 210 cm