Question

A kilogram of whole-wheat flour costs $6. What is the cost of 400 grams of flower

1 kg=1000 grams

Answer 1

`1 \ kg=1000 \ g \ - \ \$6 \\ 400 \ g \ - \ x \\ \\ (1000)/(6)=(400)/(x) \\ 1000x=400 * 6 \\ 1000x=2400 \\ x=(2400)/(1000) \\ x=2.4`

400 grams of flour cost $2.4.