If you mean: 4/20 then it is 1/5 in its simplest form
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n + 1/4 = 9/20 n + 5/20 = 9/20 n = 4/20 = 1/5
The answer is 8. One fifth of 20 is 4 because 20/5 is 4, and 4*2=8
2x + x + 4 +2x = x + 20 5x + 4 = x + 20 5x - x = 20 - 4 4x = 16 x = 4
Why is 5 x -4 = -20 ? Think of it as money. If I have four dollars then that's +4. If I owe 4 that's -4. If 5 of us owe 4 that means 20 is owed = -20 dollars a PLUS times a MINUS is a MINUS. Accept it.
well its impossible to answer since there is no x=? if it was 5x+20=40 then x=4 5 x 4=20+20=40