7th Grade Challenging Math
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7-43) Answer
9.26
cm
Solution:
The volume of the water
does not change. The left side of the equation shows the water volume
before the small cylinder is placed into the water tank. The right side of
the equation shows the water volume after the small cylinder is
inserted into the water tank.
H is the water level
after the small cylinder is placed into the water tank.
3.14 * (10/2)^2 *
10 = (3.14 * (10/2)^2 – 3.14 * (4/2)^2) * H
3.14 * 250 = 3.14 *
(25-4) * H
H = 250/21 = 9.26
cm
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