4. Four elephants and eight zebras eat a ton of food daily. An elephant eats $214 \mathrm{~kg}$ more food daily than a zebra. If a zebra needs 24 minutes to eat $1 \mathrm{~kg}$ of food, how much time does it need to eat its daily amount of food? Express the obtained time in hours and minutes.
4. Four elephants and eight zebras eat a ton of food daily. An elephant eats $214 \mathrm{~kg}$ more food daily than a zebra. If a zebra needs 24 minutes to eat $1 \mathrm{~kg}$ of food, how much time does it need to eat its daily amount of food? Express the obtained time in hours and minutes.

## Solution.

An elephant eats $214 \mathrm{~kg}$ more food daily than a zebra.

Since $214 \cdot 4=856$, four elephants eat as much as four zebras and an additional $856 \mathrm{~kg}$. 1 POINT The amount eaten by twelve zebras plus 856 kg totals one ton.

1 POINT

Since $1000-856=144$, twelve zebras eat 144 kg of food. 1 POINT

A zebra eats 144:12 = 12 kg of food daily. 1 POINT

A zebra eats $12 \cdot 24=288$ minutes daily, 1 POINT

which is 4 hours and 48 minutes. 1 POINT

TOTAL 6 POINTS