exam Maths Puzzle Numerical Ability

If there are 6 x 109 people on the Earth and there is enough freshwater to provide each person with 8.79 x 105 L, how much freshwater is on the Earth?

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exam Other Question

Can someone please explain how to figure this problem? Determine the equation of the line that has a slope of -3 and passes through the point (-3,0). Write the equation in slope intercept form. Solve the equation:

y^2 - 2y -24 = 0