Gabby used
18 of the ribbon to tie some presents. She threw away
511 of the remaining ribbon. As a result, she had 378 cm of the ribbon left. How much ribbon did Gabby have at first? Give your answer in cm.
Fraction of the ribbon left after tying some presents
= 1 -
18=
78 Fraction of the remaining ribbon left after throwing away
= 1 -
511=
611
Fraction of the total ribbon left
=
78 ×
611=
2144
Length of the ribbon at first = 44 u
Length of the ribbon left = 21 u
21 u = 378
1 u = 378 ÷ 21 = 18
Length of the ribbon at first
= 44 u
= 44 x 18
= 792 cm
Answer(s): 792 cm