exam Maths Puzzle Numerical Ability

if 2 hotdogs and 1 hamburger costs 3.39. and 3 hotdogs and 3 hamburgers cost 6.57, how much does a hotdog cost?

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exam Other Question

1. 40 kilometers per hour is equal to how many meters per second?

2. 20 meters per second is equal to many kilometers per hour? When the parking garage opened in the morning there were 100 cars in a lot A and 20 cars in lot B. after the attendant moved 20 cars from a lot A into lot B what was the ratio of the number of cars in lot A to the number of cars in lot B?