# math

posted by
**Ellie**
.

Tina solved for the decimal value 0f

(3/5*18) and got an answer of 5.4. Four of her classmates argued that her answer was not reasonable. Which of the following statements best explain why that value can not =5.4

A. the number 18 is a multiple of 3 , so the answer must be a whole number

B. The number 18 can be rounded to 20 and 3/5 can be rounded to 1, so the value of (3/5*18) must be less than 20*1, or 20

C. the fraction3/5 is greater than 1/2, so the value of (3/5*18) must be greater than 1/2 of 18 or 9

D. The fraction 3/5 is less then 1, so the value of (3/5*18) must be less than (1*18) or 18

I think it is D.

I did 18*3/5=104/5=54/5=10.8

I really wasn't sure if C or D was the better answer since to me they are both correct.

Can you help explain? thanks for your help!!