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Izzie recently took a math test where each correct answer (a) on the main part of the test was worth 5.8 points. She also correctly solved a bonus question worth 15 points. Using the equation 5.8a + 15 = 78.8, how many correct answers (a) did Izzie have on the main part of the test?
A.
59
B.
5
C.
16
D.
11