GRE Exam Numerical Ability Ratio and Proportion

The water level in a tank is lowered by 6 inches, then raised by 8 1/2 inches, and then lowered by 4 inches. If the water level was x inches before the changes in level, which of the following represents the water level, in inches, after the changes?
option
(A) x - 1 1/2
(B) x + 1 1/2
(C) x - 6 1/2
(D) x + 6 1/2
(E) x - 18 1/2

Read Solution (Total 5)

(A) x - 1 1/2
If level before the change= x
then,level after change=x -6 +8 1/2 -4 = x- 1 1/2
11 years agoHelpfull: Yes(4) No(1)

ans: x-3/2 i.e x-1(1/2)
11 years agoHelpfull: Yes(2) No(1)
correct ans is x-3/2......
11 years agoHelpfull: Yes(1) No(1)
x+8 1/2 - 6 - 4(add raised and subtract lowered)
x+17/2 - 10
x-3/2
x - 1 1/2
9 years agoHelpfull: Yes(0) No(0)
x-6+81/2-4=x-11/2
9 years agoHelpfull: Yes(0) No(0)

GRE Other Question

A rectangular game board is composed of identical squares arranged in rectangle array of r rows and r+1 columns.The r rows are numbered from 1 through r and the r+1 columns are numbered from 1 through r+1.If r>10,which of the following represents the squares on the board that are neither in the 4th row nor in the 7Th column.
a)r^2-r
2)r^2-1
3)r^2
4)r^2+1
5)r^2+r A rectangular parking lot 2x feet long and x feet wide is to be enlarged so that the lot will be 2 times as long and 3 times as wide as it is now. The area of the enlarged rectangular lot will be how many times the area of the present lot?
(A) 6
(B) 5
(C) 4
(D) 3
(E) 2