Elena purchased brand X pens for $4.00 a piece and brand Y pens for $2.80 a piece. If Elena purchased a total of 12 of these pens for $42.00, how many brand X pens did she purchase?

1.86 × 5 power of 10 is equivalent to

A. 18,600

B. 186,000

C. 18,600,000

D. 186 500,000

E. 1,860,000

How many of the numbers between 100 and 300 begin or end with 2?

A. 20

B. 40

C. 100

D. 110

E. 180

If 15 cans of food are needed for seven adults for two days, the number of cans needed to feed four adults for seven days is

A. 15

B. 20

C. 25

D. 30

E. 35

If the average (arithmetic mean) of a series of numbers is 20 and their sum is 160, how many numbers are in the series?

A. 8

B. 16

C. 32

D. 48

E. 80

If the result of squaring a number is less than the number, the number is

A. Negative And Greater Than -1.

B. Negative And Less Than -1.

C. A Positive Fraction Greater Than 1.

D. Positive And Less Than 1.

E. 1 And Only 1.