Question 159458
A rectangular swimming pool has a length of 10 feet and a width of 8 feet. The water in the pool has a depth of 6 feet. If you add 40 cubic feet of water to the pool, how much will the depth of the water increase? 
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Let x = no. of feet increase in water
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Find the volume of the water originally
10*8*6 = 480 cu ft
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When you add 40 cu ft;
10*8*(x+6) = 480 + 40
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80(x+6) = 520
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80x + 480 = 520
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80x = 520 - 480
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80x = 40
x = {{{40/80}}}
x = {{{1/2}}} ft increase in the depth
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Check 10*8*6.5 = 520
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Do you understand it now?