GMAT® Official Guide 2019 Quantitative Review
Taking (1) and (2) together gives information
on profit resulting from collecting premiums and
paying claims as well as profit resulting from
investments from accumulated surplus premiums,
but gives no indication whether there were other
sources of revenue or other types of expenses.
The correct answer is E;
both statements together are still not sufficient.
DS15349
- How many hours would it take Pump A and Pump B
working together, each at its own constant rate, to
empty a tank that was initially full?
(1) Working alone at its constant rate, Pump A would
empty the full tank in 4 hours 20 minutes.
(2) Working alone, Pump B would empty the full tank
at its constant rate of 72 liters per minute.
Arithmetic
Determine how long it would take Pumps A and
B working together, each at its own constant rate,
to empty a full tank.
(1) This indicates how long it would take
Pump A to empty the tank, but gives no
information about Pump B's constant rate;
NOT sufficient.
(2) This indicates the rate at which Pump B can
empty the tank, but without information
about the capacity of the tank or Pump .Ns
rate, it is not possible to determine how long
both pumps working together would take to
empty the tank; NOT sufficient.
Taking (1) and (2) together gives the amount of
time it would take Pump A to empty the tank
and the rate at which Pump B can empty the
tank, but without knowing the capacity of the
tank, it is not possible to determine how long
the pumps working together would take to
empty the tank.
The correct answer is E;
both statements together are still not sufficient.
0S04573
- What is the value of the integer N?
(1) 101 < N < 103
(2) 202 < 2N < 206
Arithmetic
(1) Given that Nis an integer and
101 < N < 103, it follows that N = 102;
SUFFICIENT.
(2) Given that Nis an integer and
202 < 2N < 206, it follows that
101 < N < 103 and N = 102; SUFFICIENT.
The corre:ct answer is D;
each statement alone is sufficient.
0S12033
- Is zw positive?
(1) z + w3 = 20
(2) z is positive.
Arithmetic
(1) Given that z + w^3 = 20, if z = 1 and
w = lfi§ then z + w^3 = 20 and zw is
positive. However, if z = 20 and w = 0, then
z + ·w^3 = 20 and zw is not positive; NOT
sufficient.
(2) Given that z is positive, if z = 1 and
w = ifi§, then zw is positive. However, if
z = 20 and w = 0, then zw is not positive;
NOT sufficient.
Taking (1) and (2) together is of no more help
than either (1) or (2) taken separately because the
same examples were used in both (1) and (2).
The correct answer is E;
both stat1ements together are still not sufficient.
DS03006
- On the scale drawing of a certain house plan, if
1 centimeter represents x meters, what is the value
Of X?
(1) A rectangular room that has a floor area of
12 square meters is represented by a region of
area 48 square centimeters.
(2) The 15-meter length of the house is represented
by a segment 30 centimeters long.
Arithmetic
It is given that on the scale drawing, 1 centimeter
represents x meters. Determine the value of x.
Note that 1 cm^2 represents x2 m^2.
(1) This indicates that an area of 12 m^2 is
represented by an area of 48 cm^2. Then,
