Here is the equation: x+(x+20) = 120
Since you can't combine anything yet, its x+x+20=120
You need to get x by itself
Minus 20 from both sides
Its x+x=100 now
Combine the x's which is now 2x
Now divide 100 by 2 which is 50
x=50
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Lets check:
50+(50+20)=120
Now combine the numbers in the parentheses
Its now 50+70=120
50+70=120 and 70-50=20
As you can see, he ran 50 minutes the first day and 70 minutes the second day
750 is ?% of 625
<em>Y = ?% * X</em>
Solving our equation for ?
?% = Y/X
?% = 750/625
? = 1.2
Convert decimal to percent:
<span>?% = 1.2 * 100 = 120%
</span>
Class 8 is 120% of Class 7.
If you want the percent of Class 8 to Class 7, it is:
625 is ?% of 750
<em> = ?% * X</em>
Solving the equation for ?
?% = Y/X
?% = 625/750
? = 0.8333
Convert decimal to percent:
<span>?% = 0.8333 * 100 = 83.33%
</span>Class 7 is 83.33% of Class 8.
Volume=LWH
with cube, L=W=H
with this one
L=8=W=H
V=8*8*8=512 in^2
answer is 3rd option
