Question: John buys 3 t-shirts that cost $20 each. He also buys $50 in pants. How much does he spend?
Answer: He spends 20 * 3 = $60 on t - shirts. So he spends 60 + 50 = $110 in total. The answer is 110.

Question: Heather helps her neighbour pick weeds out of her garden. She gets paid 5 cents for every weed she picks. On average, how many seconds can she take to pick a weed if she wants to earn $10 an hour?
Answer: In an hour, she needs to earn $10 * 100 cents / $1 = 1000 cents. In an hour, she must pick 1000 cents / 5 cents = 200 weeds. There are 1hr * (60 minutes / 1 hr) = 60 minutes in an hour. There are 60 minutes * (60 seconds / 1 minute) = 3600 seconds in an hour. She has 3600 seconds / 200 = 18 seconds to pick each weed. The answer is 18.

Question: In San Diego Zoo, the lion consumes 25 kilograms of meat, and the tiger consumes 20 kilograms of meat per day. If they have 90 kilograms of meat, how many days will the meats last?
Answer: The lion and tiger's daily consumption of meat is 25 + 20 = 45 kilograms. Therefore, their supply of meat will last for 90 / 45 = 2 days. The answer is 2.

Question: The house is 20.5 feet by 10 feet. The porch measures 6 feet by 4.5 feet. The house and the porch need shingles. How many square feet of shingles will be needed to roof the house and the porch?
Answer:
House = 20.5 * 10 = 205 square feet. Porch = 6 * 4.5 = 27 square feet. 205 + 27 = 232 square feet. 232 square feet of shingles will be needed. The answer is 232.