Question

nr. rationale a si.b au raportul 4 si diferenta 18. Determinati media aritmetica a nr
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Answer 1

$\frac{a}{b} = 4 = > a = 4b \\ a - b = 18 \\ inlocuim \\ 4b - b = 18 \\ 3b = 18 \\ b = 18 \div 3 \\ b = 6 \\ a = 4b = 4 \times 6 = > a = 24 \\ ma = \frac{a + b}{2} = \frac{24 + 6}{2} = \frac{30}{2} = 15$