Question

if 66 2/3% of a certain kind of ore is iron, how much pure iron can be made from 240kg of this ore? 12 metric tons?

Answer 1

Answer:

160 kg and 8 metric tons

Step-by-step explanation:

66 2/3%=2/3

(2/3)240 = 160 kg

(2/3)12 metric tons = 8 metric tons

Answer 2

Answer:

$160 kg\,,8ton$

Step-by-step explanation:

1) Firstly turning into an improper fraction. Multiplying the whole number by the denominator, then add it to the numerator,(66*3+2)/3 (over the denominator). Since it is a percentual number, we can simplify it.

$66\: \frac{2}{3}\%=\frac{200}{3}\%\Rightarrow \frac{2}{3}$

2) Then $\frac{2}{3}$ is the quantity of purity in this iron ore so:

$\frac{2}{3}*240=160$

160kg

3) 12 tons? Since 12 ton (12 000 kg) then:

$12 \,ton*\frac{2}{3}=8 \,ton$

8 ton (8000 kg)