exam Maths Puzzle Numerical Ability

1.Find the value of 20x when x=10?

2.find the value of 3a when a=-4?

3.find the value of 11(a+b) when a=7 and b=3?

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exam Other Question

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? Let f(x)=x^3. What is f(1/2)?