3 / 4 of the number a is equal to 6 / 5 of the number B. the number a is larger than the number B. if the number B is 18, the number a is ()

3 / 4 of the number a is equal to 6 / 5 of the number B. the number a is larger than the number B. if the number B is 18, the number a is ()

It should be 3 / 4 of a and 5 / 6 of B, right?
A: B
=5 out of 6: 3 out of 4
=10:9
So: a large number
A = 18 △ 9 × 10 = 20
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