SOLUTION: 1). Sandra drove for 148.2 miles and used 9.9 gallons of gas. Estimate the number of miles Sandra�s car gets per gallon. 2). Bob wants to have concrete driveway in front of hi

Question 189709: 1). Sandra drove for 148.2 miles and used 9.9 gallons of gas. Estimate the number of miles Sandra�s car gets per gallon.
2). Bob wants to have concrete driveway in front of his house. The driveway will measure 58 2/3 feet long and 18 1/2 feet wide; and will be 3/4 foot thick. How many cubic yards of cement will be needed for the driveway? Round your answer to the nearest cubic yard. [1 cubic yd = 27 cubic feet]
Can someone help me solve this question, I am totally confused. These are mixed number questions. I haven't done math is so many years, need a little help please.

Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
1). Sandra drove for 148.2 miles and used 9.9 gallons of gas. Estimate the number of miles Sandra�s car gets per gallon.
Simply divide 148.2 by 9.9
148.2/9.9 = 14.9697
Or, 15 miles per gallon
.
2). Bob wants to have concrete driveway in front of his house. The driveway will measure 58 2/3 feet long and 18 1/2 feet wide; and will be 3/4 foot thick. How many cubic yards of cement will be needed for the driveway? Round your answer to the nearest cubic yard. [1 cubic yd = 27 cubic feet]
Volume of concrete needed is
58 2/3 * 18 1/2 * 3/4
Or course, we change the mixed number to an improper fraction:
(58+2/3) * (18+1/2) * 3/4
(174/3+2/3) * (36/2+1/2) * 3/4
176/3 * 37/2 * 3/4
(176*37*3)/(3*2*4)
(19536)/(24)
814 cubic feet
.
Then because [1 cubic yd = 27 cubic feet]:
814/27 = 30.148 cubic yard
rounding
30 cubic yard

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