10 lbs/$12= 1 lb/x dollars.
If you rewrite it up and down and not slanted, it would be clearer to understand, but anyways, you cross multiply:
12*1=12
12/10= 1.2
So the answer is 1.2, if you put it on that bubble sheet, put 1, then a decimal, after the decimal 2, and then all 0's,.
First, multiply the 7 on both sides.


Finally divide by -1 on both sides to get t = -7/15 as your answer.
400 : 1kg
400 : 1000
1 : 2.5
n = 2.5