Question

Find the Harmonic Mean of 30 and 70​

Answer 1

Step-by-step explanation:

$H. M= \frac{2ab}{a + b} \\ = \frac{2(30)(70)}{30 + 70} \\ = \frac{2(30)(70)}{100} \\ = 2 \times 3 \times 7 \\ H. M= 42$