25 \% +40 \% +x \% +20 \% =100
Solve for x
x=9915
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25+40+x+20=10000
Multiply both sides of the equation by 100.
65+x+20=10000
Add 25 and 40 to get 65.
85+x=10000
Add 65 and 20 to get 85.
x=10000-85
Subtract 85 from both sides.
x=9915
Subtract 85 from 10000 to get 9915.
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