Basically, you are asked to find the volume of a cylinder with a diameter of 14 inches and a height of 18 inches. The formula for the volume of a cylinder is
V = pi*(r^2)*h
r is just the half of the diameter. In this case, r = 14/2 = 7. Then,
<span>Faster maid DATA: time = x hr/job ; rate = 1/x job/jhr Slower maid DATA: time = 3x hr/job ; rate = 1/3x job/hr Together DATA: time = 3 hr/job ; rate = 1/3 job/hr Equation: rate + rate = together rate 1/x + 1/3x = 1/3 Multiply thru by 3x to get: 3 + 1 = x x = 4 hrs (time for the faster maid to do the job)</span>
