<span><span>The sum of a squared and b is given by
</span>7 times the sum of a squared and b is given by
</span><span>
while 4 times the sum of a squared and b is given by
</span>
Therefore, <span>7 times the sum of a squared and b minus 4 times the sum of a squared and b is given by
</span>
Answer:
Getting through ratio method
100-20=80 percent have to pay
18:80
<em>x</em>:100
cross multiply
80 x <em>x=1</em>8 x 100
80x=1800
x=1800/80
x=22.5
So the original price was $22.50
Step-by-step explanation:
It will just keep going on as a decimal so you do not need to keep going, three spaces after the decimal should be an acceptable answer.