Three pieces of fabric have a combined length of 120m. After cutting of the first piece, of the second piece, and of the third piece, the remaining lengths of all three pieces are equal. What were the original lengths of each piece?
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Official Explanation
Three Pieces of Fabric Length Problem
Understanding the Problem
We have three pieces of fabric with original lengths:
- First piece: meters
- Second piece: meters
- Third piece: meters
Their combined length is 120 meters:
Fractions cut from each piece:
- First piece: cut → remaining:
- Second piece: cut → remaining:
- Third piece: cut → remaining:
After cutting, remaining lengths are equal:
Setting Up Equations
Let equal remaining length be :
- →
- →
- →
Substitute into total length equation:
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This is exactly what I needed to practice
Great question!
thanks, helpful!
How do you set up the equation for the remainders? I got 2/5 x = 1/3 y = 1/2 z but then I'm stuck
just express everything in terms of one variable, like let the common remainder be k and work backwards
oh that makes way more sense than what i was doing, thanks
Wait why isn't A right? The first piece being 40m seems fine to me
check if the remainders actually match for A, they don't
A is a trap because the numbers add to 120 but the remainders aren't equal
What it tests
Your ability to convert between fractions, ratios, and decimals and to reason proportionally.
Common trap
Cross-multiplying incorrectly or mixing up the ratio parts — a part:part ratio is not a fraction of the whole.