Over a holiday weekend, a certain car dealer sold off 4 of the cars on its lot. If the cars sold for an average of $6,000 each, how many cars were on the dealer's lot at the beginning of the weekend?

(1) The average value of the remaining cars on the lot is $5,000.

(2) The car dealer made $48,000 in car sales over the weekend.

If the ratio of brown cars to blue cars in a certain parking lot is 2:3, how many brown cars are in the lot?

(1) There are 15 blue cars in the lot.

(2) There are 25 cars total in the lot.

If the square root of t is a real number, is the square root of t positive?

(1) t＞0

(2) t2＞0