For the expression 15-15z to have a negative value, what must be true about the value of z?
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Answer: 60 of the patients are boys.
Step-by-step explanation: According to what is described, 5 in 8 patients are girls, then: 8 - 5 = 3, i.e., 3 in 8 are boys.
Mathematically the proportionality is
If 160 patients have appointments per month and are boys:
160. = 60
Per month, 60 boys have appointments at the medical office.