18 is 25% of what number? A) 36
B) 48
C) 72
D) 84

The answer to your question is the letter C. 72

Step-by-step explanation:

Data

Number 18

Percent = 25%

Number 2 = ?

Percent 2 = 100%

To solve this problem, use proportions and cross multiplication. 18 is 25% the unkown number is 100%.

                         18 25%

                          x   100%

                                x = (100 x 18) / 25

                               x = 1800/25

                              x = 72

Insert a number into the x,

the middle column, you just substitute,

and the last column, you enter what x and y is.

Step-by-step explanation:

For example,

if x was 5, I would write 5 under the column,

under the y=2x+5 column, you would write y=2*5+5,

and under the last column you would write (5, 15)