Answer:

Step-by-step explanation:

3/4 and 2/5 have a common denominator which is twenty so you can rewrite the equation with just knowing that



You can then multiply both sides by twenty to solve this equation.
Hope this helps.
Divide both sides by -0.7 to get rid of that pesky thing in the front
0.3x-0.8=6.4
add 0.8 to both sides
0.3x=7.2
divide both sides by 0.3
x=24
500% of 120
We can set up a proprtion
120/x=100/500<span> </span>
<span>120=0.2*x </span>
<span>120/0.2=x </span>
<span>600=x </span>
<span>x=600
Final answer: 600
</span>
17 1/4 because I did addition.