If 3 / A and 7 / b are true fractions, and 3 / a plus 7 / B is about 1.38, how much is a / b?

If 3 / A and 7 / b are true fractions, and 3 / a plus 7 / B is about 1.38, how much is a / b?

Because 1 / 3 = 0.33
So a / 3 is 2 / 3
A=2
1.38-2/3≈1.38-0.67=0.71
B 0.71x7≈5
So B / a = 5 / 2
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A / 3 and B / 7 are true fractions, and a / 3 + B / 7 is about 1.38, so what is a / b?

From the fact that both a / 3 and B / 7 are true fractions, we know that:
a

If the sum of 3 A and 7 B is the true fraction, and the sum of 3 A and 7 B is about 1.38, then a equals, B equals

a=2,b=5