exam
Maths Puzzle
Numerical Ability
y=x+3
8x-7y=12
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exam Other Question
REDUCE:
(a^2-b^2)(a+b)/(a+b)^2
A plane flies 500 miles with the wind and 340 miles against the wind in the same length of time. If the speed of the wind is 28mph, what is the speed of the plane in still air?