How do you solve 3.5(x84)=2.8?

2 Answers
Feb 19, 2016

x=145

Explanation:

Simplify 8/4 to 2.

3.5(x2)=2.8

Divide both sides by 3.5

x2=0.8

Add 2 to both sides.

x=2.8=145

Feb 19, 2016

x=245

Explanation:

First do the easy bit and replace 84 with 2

XXX3.5(x2)=2.8

Divide both sides by 3.5
(this is easier if you notice 3.5=7×0.5 and 2.8=7×0.4)
XXX(x2)=45

Add 2 to both sides:
XXXx=245 (or 145)