exam Maths Puzzle Numerical Ability

Of 100 people people in a room, 70 play tennis and 50 play golf. At most, how many play only one of these sports?

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exam Other Question

Perform the indicated operation.

x squared - 3x OVER 5x squared TIMES 10x OVER x squared - 4x + 3 determine if the equation represents ay as a function of x.
x^2+y=4
please help me thanks