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Maths Puzzle
Numerical Ability
D-16, Construction: Concrete weighs 150 lb/cu ft. What is the weight of a concrete wall 18 ft. long, 4 ft 6 in high, and 8 in. thick?
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Need help with these problems. Not understanding the process on how to solve.
1. Simplify the rational expression:
x2 - 6x + 5
x2 - 25
2. Divide:
x2 - 9x + 8 ÷ x2
A six passenger plane cruises at 180 mph in calm air. If the plane flies 7 miles with the wind in the same amount of time as it flies 5 miles against the wind, then what is the wind speed?