book Maths Puzzle Numerical Ability

solve for x: b-2x=3b-4x

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book Other Question

the first side of a triangle is 5 more than 3 times the third side. the second side is 5 less than twice the third side. if the perimeter is 60cm, how long is each side? How much money should be invested in an annual interest rate of 8% in order to earn $250 of yearly interest?

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