book Maths Puzzle Numerical Ability

15K^3
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5K Simplfy I thought the answer is 3k^3
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5k

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book Other Question

how do you solve 2000=.75b-10000=.30p
(profit =income - expenses)
solve the linear system...if the system is inconsistent or dependent, so state...

x/6 + y/3 = 8
x/4 + y/2 = 12