All you would do is multiply .9 by 20
.9*20=18
90% of 20 is 18
I'm not 100 percent sure I think d
Well the answer is 0 because if anything = 0 then it has to be multiplied by 0 so x = 0
Your answer would be 10 notes for $4. If you need your answer explained just let me know. :)
So the equation looks like this : 15*3x=78
subtract 15 from both sides: -15 -15
then divide by 3 from both sides
to isolate the variable: 3x=63
3/3x=63/3
x=21 (your mystery number is 21)
