@gmat_group
@AlijonovSirojiddin
20.
The rate of a certain chemical reaction is directly proportional to
the square of the concentration of chemical A present and
inversely proportional to the concentration of chemical B present.
If the concentration of chemical B is increased by 100 percent,
which of the following is closest to the percent change in the
concentration of chemical A required to keep the reaction rate
unchanged?
A) increase, 30%
B) increase, 40%
C) increase, 50%
D) decrease, 40%
E) decrease, 30%
@gmat_group
@AlijonovSirojiddin
21.
Of the 800 employees in a certain company, 70% have serviced
more than 10 years. A number of y of those who have serviced
more than 10 years will retire and no fresh employees join in.
When is y if the 10 years employees become 60% of the total
employees?
A) 200
B) 160
C) 112
D) 80
E) 56
@gmat_group
@AlijonovSirojiddin
22.
Before being simplified, the instructions for computing income tax
in Country R were to add 2 percent of one's annual income to the
average (arithmetic mean) of 100 units of Country R's currency
and 1 percent of one's annual income. Which of the following
represents the simplified formula for computing the income tax, in
Country R's currency, for a person in that country whose annual
income is A?
A) 50+A/200
B) 50+3A/100
C) 50+A/40
D) 100+A/50
E) 100+3A/100
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