Are there any number pairs that satisfy both constraints? (1) The sum is 6.
(2) The sum is 7.

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?