Laura loves to cook. One day she decided to make dinner for her family. She bought the necessary ingredients for this occasion: two salads, 2 kilograms of beef, 1 kilogram of potatoes, and two liters of juice. One salad costs $3, and one kilogram of beef is two times more expensive. One kilogram of potatoes costs one-third of the price of one salad, and one liter of juice is $1.5. How much did Laura need to pay for all the products she bought? Think carefully first, then make a decision:
Laura bought two salads, for 2 * 3 = $6. One kilogram of beef is two times more expensive than one salad, which means it cost 2 * 3 = $6. So Laura spend 2 * 6 = $12 on beef. One kilogram of potatoes costs only 3 * 1 / 3 = $1, and that's how much Laura paid for potatoes. Laura bought two liters of juice, so she did spend on them 2 * 1.5 = $3. So in total Laura paid 6 + 12 + 1 + 3 = $22. So, the answer is 22.