38.2k views
3 votes
Solve x/5 - x/2 =21. What is the value of x?
A.-70
B.-7
C.7
D.70

User Mitsuru
by
7.3k points

2 Answers

3 votes

Answer:

A. -70

Explanation:

Solve x/5 - x/2 =21. What is the value of x? A.-70 B.-7 C.7 D.70-example-1
User Hui Wang
by
7.2k points
5 votes


(x)/(5) - (x)/(2) = 21

We need a common denominator to subtract. Easiest way to do this is to find the LCM for both denominators. The number 10 will work since both 5 and 2 are multiples of 10 and 10 is LCM is 10 and 2.


(x)/(5) - (x)/(2) = 21 =>


(2x)/(10) - (5x)/(10) = 21

Subtract normally.


(2x)/(10) - (5x)/(10) = 21 =>


(-3x)/(10) = 21

Multiply each side by 10


(-3x)/(10) = 21 =>


-3x = 210

Divide both sides by -3


-3x = 210 =>

x = -70

The correct answer is A.

User Chenyf
by
7.7k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories