850 * (1 - 0.60) = 340
1700/340 = 5
5 months
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The poorly worded question leaves doubt as to what the answer is. If Ken gave Andrew 10 more marbles, and Andrew ends up with a hundred, Andrew started with 90. If Ken gave him the same number Andrew already had plus ten to equal 100 marbles, Andrew started with 45 and Ken gave him 55.
$20
x = andrew's money 100 - 20 = 5x 80 = 5x 80/5 = x 16 = x ^^^ MEGHAN AND SAM'S ANSWER!!! :D
Andrew Wiley, who solved Fermat's Last Theorem. Andrew Wiley, who solved Fermat's Last Theorem.
Sir Andrew Wiles