Answer: 5
Step-by-step explanation: 18+7.5 =25.5 25+6=31, 25.5+7.5 =33 31+6=37, 33+7.5 =40.5, 37+6=43 40.5+7.5=48, 43+6=49, 48+7.5=55.5 49+6=55
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