The answer is C: the missing number is 25
3a + b = 54...when b = 9
3a + 9 = 54
3a = 54 - 9
3a = 45
a = 45/3
a = 15 <===
0.1875 you must divide 3 by 16 the numerator by the denominator
Answer: What is the quastion dont under satand.
Step-by-step explanation: