A boat is traveling across a square lake at 10 MPH. It takes 2 hours to go across the length of the lake. It then travels the whole width of the lake at the same speed, which takes 30 minutes. How many square miles is the lake? Give the rationale and then the answer.
Let's think step by step. The lake is 20 miles across because 2 x 10 = 20. If takes .5 hours to go from bottom to top because 30 / 60 = .5. The lake is five miles from bottom to top because 10 x .5 = 5. The square mileage is 100 because 20 x 5 = 100.. The answer is: 100.

James binges on Cheezits and eats 3 bags that are 2 ounces each. There are 150 calories in an ounce of Cheezits. He then goes for a 40-minute run and burns 12 calories per minute. How many excess calories did he eat? Give the rationale and then the answer.
Let's think step by step. He ate 2 * 3 = 6 ounces of cheez its. That means he ate 6 * 150 = 900 calories. He burned 40 * 12 = 480 calories. So he ate an excess of 900 - 480 = 420 calories.. The answer is: 420.

In a grocery store, Julia bought 2 pieces of Snickers and 3 packs of M&M's. If each piece of Snickers costs $1.5 and a pack of M&M's has the same cost as 2 Snickers, how much is Julia's change if she gave the cashier 2 $10 bills? Give the rationale and then the answer.
Let's think step by step. Two pieces of snickers cost $1.5 x 2 = $3. One pack of M&M's costs $3 so 3 packs cost $3 x 3 = $9. The total amount that she needs to pay is $3 + $9 = $12. Julia gave the cashier $10 x 2 = $20. So, her change is $20 - $12 = $8.. The answer is: 8.