Question

express 40 cm as a percent of 3m and 20 cm

Answer 1

3m 20cm=320cm

Let x percent of 320 be 40

$320 \times \frac{x}{100} = 40 \\ x = \frac{40 \times 100}{320} \\ x = \frac{100}{8} \\ x = 12.5$

So 12.5% of 3m 20cm is 40 cm