exam Maths Puzzle Numerical Ability

Perform order of operation. Please show me how for this one. thanks!

(X-4) (X+7)

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exam Other Question

if -6(2x+1)=-4x+10, then x = One pump can fill a water tank in 25 minutes. Another pump can fill the same tank in 50 minutes. If the first pump is open for 5 minutes before the second is opened, how long will it take to fill the tank?