Truck

The truck passed 4550 km in 5 days. The first three days passed every day the same way. The fourth day passed 630 km and the fifth day was 920 km. How many km has passed the first three days?

Correct result:

x =  1000 km

Solution:

$x=(4550-630-920)\mathrm{/}3=1000\text{ km}$

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