book Maths Puzzle Numerical Ability

The perimeter of a triangle is 100 in. the base is 4 inches greater then the legs. What are the lengths?

Base=?
Leg=?
Leg?

show work thanks so much!!

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book Other Question

Solve: x^3-125=0 A collection of dimes and quarters is worth $5.45. There are 32 coins in all. How many of each type of coin are there?

so for this one, i know that we should make D=dimes and Q=quarters.. but thats where my knowledge ends.