exam Maths Puzzle Numerical Ability

Can a particular equation represent the relationship between variables in two different word problems?

For example,
Can you explain how certain distance-rate-time problems are similar to some simple-interest problems?

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exam Other Question
If the sides of a square are decreased by 3 cm, the area is decreased by 81 cm^2. What were the dimensions of the origional square? what is the answer of

1. 5x -15 > 2x +3

2. -y + 2y >"or equal to" -8 -5y

3. 12g + 6 < 2g -3 + g

4. 3 (y-3) -5y > 3