Mathematics
tuyen100dola
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David inherited some money from his uncle. He invested half of the money with Bernie Madoff (none of which he recovered), lost one-third of it due to identity theft, lost another eighth of the money at a casino, and used the remaining $40,000 to buy a car. How much money did David inherit?

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JamieJamieJamie

Given: Let x be the whole amount inherited. 1/2 * x - invested with Bernie Madoff 1/3 * x - lost due to identity theft 1/8 * x - lost in casino 40,000 - remainder x - x/2 - x/3 - x/8 = 40,000 LCM:  2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 3: 3, 6, 9, 12, 15, 18, 21, 24 8: 8, 16, 24,     x * 24/24 = 24x / 24 x/2 * 12/12 = 12x / 24 x/3 *   8/8   = 8x / 24 x/8 *   3/3   = 3x / 24 40,000 * 24/24 = 960,000 / 24 24x/24 - 12x/24 - 8x/24 - 3x/24 = 960,000/24 (24x - 12x - 8x - 3x)/24 = 960,000/24 x/24 = 960,000/24 24 * x/24 = 24 * 960,000/24 x = 960,000 x = 960,000 initial inheritance x/2 = 960,000/2 = 480,000 invested with Bernie Madoff x/3 = 960,000/3 = 320,000 lost due to identity theft x/8 = 960,000/8 = 120,000 lost in the casino 40,000 - remaining amount. 960k - 480k - 320k - 120k = 40k 40k = 40k  

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