exam Maths Puzzle Numerical Ability

Divide

x^4+x^2-80/x+3

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exam Other Question

3(x+y)+4(x+y)-6 when x=4 andy=-1 if steven can mix 20 drinks in 5 minutes.sue can mix 20 drinks in 10 minutes. jack can mix 20 drinks in 15 minutes.how much time will it take all three of them working together to mix the 20 drinks