Nora used
18 of the string to tie some presents. She threw away
511 of the remaining string. As a result, she had 336 cm of the string left. How much string did Nora have at first? Give your answer in cm.
Fraction of the string left after tying some presents
= 1 -
18=
78 Fraction of the remaining string left after throwing away
= 1 -
511=
611
Fraction of the total string left
=
78 ×
611=
2144
Length of the string at first = 44 u
Length of the string left = 21 u
21 u = 336
1 u = 336 ÷ 21 = 16
Length of the string at first
= 44 u
= 44 x 16
= 704 cm
Answer(s): 704 cm