Answer this question:Bill is trying to control the pests in his garden. Each spider he introduces eats 7 bugs, and each time he sprays the garden he reduces the total bug population to 80% of what it was previously. If the garden has 400 bugs to start, and Bill sprays once and introduces 12 spiders, how many bugs are left?
First find the total bug population after spraying: 80% * 400 bugs = 320 bugs. Then find the total number of bugs each spider eats: 12 spiders * 7 bugs / spider = 84 bugs. Then subtract that number from the number of bugs left after spraying to find final number of bugs: 320 bugs - 84 bugs = 236 bugs.
The answer is 236.

Answer this question:A Whatsapp group has members sending messages every day sharing about how each one's day was. Last week, 300 messages were sent by the members on Monday, 200 messages on Tuesday, 300 more messages on Wednesday than the previous day, and two times as many messages on Thursday as there were on Wednesday. Calculate the number of messages sent in the Whatsapp group after the four days.
The total number of messages sent last week on Monday and Tuesday is 300 + 200 = 500 messages. On Wednesday, the number of messages was 300 more than the previous day, a total of 300 + 200 = 500 messages. In total, in the three days, the number of messages sent is 500 + 500 = 1000 messages,. On Thursday, the number of messages sent was two times the number sent on Wednesday, totaling 2 * 500 = 1000 messages. In the four days. the number of messages sent is 1000 + 1000 = 2000.
The answer is 2000.

Answer this question:Jim spends 8 hours scuba diving. In that time he finds a treasure chest with 100 gold coins in it. He also finds 2 smaller bags that have half as much gold each. How much gold does he find per hour?
The smaller bags each have 100 / 2 = 50 gold coins each. So in total, they have 50 * 2 = 100 coins. So he found 100 + 100 = 200 coins. So he finds 200 / 8 = 25 coins an hour.
The answer is 25.

Answer this question:When Spencer jumps rope, he jumps 4 times per minute. He jumps for 10 minutes each session and does 2 sessions each day. How many jumps will Spencer do in 5 days?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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In 1 session he jumps 4 times / minute * 10 minutes = 40 times. In 5 days he does 2 sessions / day * 5 days = 10 sessions. He jumps 10 sessions * 40 times / session = 400 times in 5 days.
The answer is 400.