If 20% of a is equal to 80% of b which of the following is equal to a + b?
- 3a
- 2.5a
- 2a
- 1.25a
Explanation
If 20% of a = 80% of b
Then:
0.2 x a = 0.8 x b
a = 0.8 / 0.2 x b
a = 4b
So:
a + b = 4b + b = 5b
And in terms of a:
a + b = a + a/4 = 5a/4 = 1.25a
Last verified on 10-10-2026
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