Gabby used
25 of the thread to tie some presents. She threw away
79 of the remaining thread. As a result, she had 30 cm of the thread left. How much thread did Gabby have at first? Give your answer in cm.
Fraction of the thread left after tying some presents
= 1 -
25=
35 Fraction of the remaining thread left after throwing away
= 1 -
79=
29
Fraction of the total thread left
=
35 ×
29=
215
Length of the thread at first = 15 u
Length of the thread left = 2 u
2 u = 30
1 u = 30 ÷ 2 = 15
Length of the thread at first
= 15 u
= 15 x 15
= 225 cm
Answer(s): 225 cm