Sarah used
411 of the string to tie some presents. She threw away
511 of the remaining string. As a result, she had 462 cm of the string left. How much string did Sarah have at first? Give your answer in cm.
Fraction of the string left after tying some presents
= 1 -
411=
711 Fraction of the remaining string left after throwing away
= 1 -
511=
611
Fraction of the total string left
=
711 ×
611=
42121
Length of the string at first = 121 u
Length of the string left = 42 u
42 u = 462
1 u = 462 ÷ 42 = 11
Length of the string at first
= 121 u
= 121 x 11
= 1331 cm
Answer(s): 1331 cm