book Maths Puzzle Numerical Ability

Solve and check the equation 9(b - 4) -7b = 5(3b - 2)

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(1/2y^2 z+ 3/4yz-1/8z^2)+(3/4y^2 z+3/4yz+z^2) A 1000 L tank now contains 240 L of water. How long will it take to fill the tank using a pump that pumps 25 L per minute?