If a and B are positive integers, and 5A + 3B = 70, then the values of a and B satisfying the formula have () pairs. A.2. B.3. C.4. D.5

a=(70-3b)/5
Because a is a positive integer, 3b must be a multiple of 5. Because there is no factor 5 in 3, B is a multiple of 5
And 70 > 3B > 0
Therefore, there are only four B that meet the requirements, which are b = 5, 10, 15 and 20
So choose C

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