exam Maths Puzzle Numerical Ability

Solve for X

(x - 4)/2 - 1/5 = (7x + 1)/20

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exam Other Question

The directions say factor the trinomial if possible.

6b squared-11b-2 A 8 horsepower pump fills a tank in 8 hours. A 3 horsepower pump fills it in 12 hours. Both pumps are turned on and begin to fill the tank. After 4 hours the 8 horsepower pump breaks. How long will it take the 3 horsepower pump to finish?