A developer has land that has x feet of lake frontage. The land is to be subdivided into lots, each of which is to have either 80 feet or 100 feet of lake frontage. If 1/9 of the lots are to have 80 feet of frontage each and the remaining 64 lots are to have 100 feet of frontage each, what is the value of x ?  Choices
A) 400 B) 3,200 C) 3,700 D) 7,040 E) 4,760
Total number of plots,be T   Plots with 80ft is (1/9)th of total plots.   Plots with 100ft frontage = (8/9) X total number of plots   i.e 8/9 X T = 64 T = 72   Total lake frontage = 64X100 + 8X80 = 7040   Answer : 7,040
<result>D</result>
A developer has land that has x feet of lake frontage. The land is to be subdivided into lots, each of which is to have either 80 feet or 100 feet of lake frontage. If 1/9 of the lots are to have 80 feet of frontage each and the remaining 64 lots are to have 100 feet of frontage each, what is the value of x ?