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Thor just filled his truck's gas tank with 20 gallons of a m

Thor just filled his truck's gas tank with 20 gallons of a mixture consisting of 10% additive and 90% gasoline. If his truck runs best on a mixture consisting of 20% additive and 80% gasoline, how many gallons of additive must he add into the gas tank for his truck to achieve optimum performance? a)...

by DivyaD

Fri Jan 18, 2019 4:24 am
Forum: GMAT Math
Topic: Thor just filled his truck's gas tank with 20 gallons of a m
Replies: 3
Views: 1403

Does (a – 2)(b + 4) = 8?

Does (a – 2)(b + 4) = 8?
(1) ab = 2b – 4a
(2) a = 6

by DivyaD

Fri Jan 18, 2019 4:21 am
Forum: GMAT Math
Topic: Does (a – 2)(b + 4) = 8?
Replies: 2
Views: 1140

Each number in each of lists L and M above is positive.

List L: r, s, t, u, v List M: w, x, y, z Each number in each of lists L and M above is positive. The ratio of the average (arithmetic mean) of the numbers in list L to the average of the numbers in list M is 3 to 7. What is the ratio of the average of all the numbers in both lists L and M to the ave...

by DivyaD

Fri Jan 18, 2019 4:20 am
Forum: GMAT Math
Topic: Each number in each of lists L and M above is positive.
Replies: 2
Views: 1210

If x is an integer greater than 2, the function f(x)

If x is an integer greater than 2, the function f(x) represents the product of all even integers between 2 and x, inclusive. What is f(51) –f(50)?

a) (51)50!
b) (502)49!
c) 50
d) 1
e) 0

by DivyaD

Fri Jan 18, 2019 4:17 am
Forum: GMAT Math
Topic: If x is an integer greater than 2, the function f(x)
Replies: 5
Views: 5654

is x > 0?

Is x > 0 ?
(1) x – y > –8
(2) x + y = –8

by DivyaD

Fri Jan 18, 2019 4:15 am
Forum: GMAT Math
Topic: is x > 0?
Replies: 3
Views: 1210

If x and y are consecutive integers such that x < y and x

If x and y are consecutive integers such that x < y and x is odd, which of the following must be true?
I. xy – y is odd.
II. x(x + y) is even.
III. x2 + y2 is odd.

a) None
b) III only
c) I and II
d) I and III
e) II and III

by DivyaD

Fri Jan 18, 2019 4:14 am
Forum: GMAT Math
Topic: If x and y are consecutive integers such that x < y and x
Replies: 3
Views: 1245

A fair die has sides labeled with 1, 2, 3, 4, 5, and 6 dots.

A fair die has sides labeled with 1, 2, 3, 4, 5, and 6 dots. If the die is rolled 4 times, what is the probability that on at least one roll, the die will show a 6?

a) $$\frac{1}{6}$$
b) $$\frac{625}{1296}$$
c) $$\frac{649}{1296}$$
c) $$\frac{671}{1296}$$
d) $$\frac{2}{3}$$

by DivyaD

Fri Jan 18, 2019 4:11 am
Forum: GMAT Math
Topic: A fair die has sides labeled with 1, 2, 3, 4, 5, and 6 dots.
Replies: 2
Views: 1165

If $$\sqrt{x}\ $$ and $$\sqrt{y}$$ are nonzero

If $$\sqrt{x}\ $$ and $$\sqrt{y}$$ are nonzero integers, what is the remainder when x is divided by y?
(1) $$\sqrt{x}\ -\ \sqrt{y}$$ = 1
(2) x–y is a positive integer.

by DivyaD

Fri Jan 18, 2019 4:07 am
Forum: GMAT Math
Topic: If $$\sqrt{x}\ $$ and $$\sqrt{y}$$ are nonzero
Replies: 2
Views: 1088

A certain furniture store must choose between trucking

A certain furniture store must choose between trucking companies A and B for its local deliveries. If company A charges per delivery, and company B charges per week plus a mileage charge, which company would cost the store less? (1) Company A charges $45 per delivery and company B charges $600 per w...

by DivyaD

Fri Jan 18, 2019 4:02 am
Forum: GMAT Math
Topic: A certain furniture store must choose between trucking
Replies: 2
Views: 1762

What is the average (arithmetic mean) of x, y, and z?

What is the average (arithmetic mean) of x, y, and z?

(1) —x − 4y + 3z = 14

(2) 5x + 8y + z = 26

by DivyaD

Fri Jan 18, 2019 4:00 am
Forum: GMAT Math
Topic: What is the average (arithmetic mean) of x, y, and z?
Replies: 3
Views: 1659