Since they have the same denominator (4) which is the number on the bottom of the fraction, you can just add the numerators (3 and 4), which are on the top of the fraction, together:
3/4 + 4/4 = 7/4
30/2 = 15
15 x 5 = 75
The number is 75.
A because the graph of a direct proportion crosses the origin.
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