What is the ratio of the number of boys to girls on the school bus?

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(1) The number of boys is 5 less than twice the number of girls. We can write B=2G-5. Even substituting, our ratio would be B/G = (2G-5)/G, which does not simplify to a real number. NS

(2) The difference between the number of boys and number of girls is 35. We can write B-G = 35 --> B = 35+G. Similarly as with (1). This does not simplify to a real number. NS

(1) and (2) combining (1) and (2) We have two variables with two equations: B = 35+G and B=2G-5. Notice that Neither equation is a multiple of the other, so both equations provide new information. From here we can solve 0 = 40-G and G = 40, Thus B = 75, thus B/G = 75/40, but we dont have to calculate this far. Sufficient.

The answer is C