exam Maths Puzzle Numerical Ability

86. Social science. If there are 6  10(9th power) people on the Earth and there is enough freshwaterto provide each person with 8.79  10(5th power)L, how much freshwater is on th

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exam Other Question
Use the formula a(sub1) + a(sub1)r + a(sub1)r^2 + ... a(sub1)^n-1 =
a(sub1) 1-r^n/1-r for the nth partial sum of a geometric sequence to find the sum 1 + 2/3 + 4/9 + 8/27 + ... 64 12a^3/25

(x^2y^-3z)^1/2/x^1/2yz^-1/2

(2radical x - radical y)(radical x +radical y)

-3-radical 18/-6