TJ ran a 10K race last Saturday. He ran the first half in 20 minutes. He completed the second half in 30 minutes. What was his average time per kilometer?
Let's think: He ran the 10 kilometers in a total of 20 + 30 = 50 minutes. Therefore, he ran at a pace of 50 minutes / 10 kilometers = 5 minutes per kilometer.. The answer is: 5.

Jenna's doctor tells her that she should tan no more than 200 minutes a month. If she tans 30 minutes a day, two days a week for the first two weeks of the month, how many minutes can she tan in the last two weeks of the month?
Let's think: First find how many minutes Jenna tans each of the first two weeks: 30 minutes / day * 2 days / week = 60 minutes / week. Then multiply that number by the number of weeks to find how many minutes Jenna tans in the first half of the month: 60 minutes / week * 2 weeks = 120 minutes. Then subtract that time from the total time Jenna can spend tanning to find how many more minutes she can tan: 200 minutes - 120 minutes = 80 minutes.. The answer is: 80.

Jimmy decides to make sandwiches for a picnic. He makes 8 sandwiches in total, using two slices of bread each. How many packs of bread does he need to buy to make these sandwiches, assuming he starts with no bread and each pack has 4 slices of bread in it?
Let's think: First, we need to determine how many slices of bread Jimmy will use to make the sandwiches. We determine this by performing 8 * 2 = 16 slices of bread needed. We then divide the number of slices needed by the number of slices per bread pack, performing 16 / 4 = 4 packs of bread needed.. The answer is: 4.

Kalani has twenty candles in her bedroom, twice the number of candles in the living room. Donovan, her brother, brings in 20 more candles he bought from the candle shop. What's the total number of candles in the house?
Let's think:
If the number of candles in the bedroom is twice the number in the living room, there are 20 / 2 = 10 candles in the living room. When Donovan brings in 20 more candles, the total number of candles becomes 10 + 20 + 20 = 50.. The answer is: 50.