Third year. What was the amount of the dollar decrease in the property price during the second year

@gmat_group 
 
@AlijonovSirojiddin 
11.
 
 
Three grades of milk are 1 percent, 2 percent, and 3 percent by 
volume. If x gallons of 1 percent grade, y gallons of 2 percent 
grade, z gallons of 3 percent grade are mixed to give x+y+z 
gallons of a 1.5 percent grade, what is x in terms of y and z? 
A) x=y+z 
B) 
2
y
z
x
+
=
C) x=2y+3z 
D) x=y+2z 
E) x=y+3z

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@gmat_group 
 
@AlijonovSirojiddin 
12.
 
 
Whenever Martin has a restaurant bill with an amount between 
$10 and $99, he calculates the dollar amount of the tip as 2 times 
the tens digit of the amount of his bill. If the amount of Martin' 
most recent restaurant bill was between $10 and $99, was the tip 
calculated by Martin on this bill greater than 15 percent of the 
amount of the bill? 
(1) The amount of the bill was between $15 and $30 
(2) The tip calculated by Martin was $8 

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@gmat_group 
 
@AlijonovSirojiddin 
13.
 
 
Jack and Mark both received hourly wage increases of 6 percent. 
After the increases, Jack' hourly wage was how many dollars per 
hour more than Mark's? 
(1) Before the wage increases, Jack's hourly wage is $5 per hour 
more than Mark's 
(2) Before the wage increases, the ratio of the Jack's hourly wage 
to Mark's hourly wage is 4 to 3 

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@gmat_group 
 
@AlijonovSirojiddin 
14.
 
 
A manufacture produced x percent more video cameras in 1994 
than in 1993 and y percent more video cameras in 1995 than in 
1994. If the manufacturer produced 1,000 video cameras in 1993, 
how many video cameras did the manufacturer produce in 1995? 
(1) xy=20
(2) x+y+xy/100 = 9.2 

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