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Xiaomei is 8 years old and her father is 36 years old. When Xiaomei was how old, her father was three times as old as Xiaomei Equations to be listed
（36-8）÷（3-1）
=28÷2
=14 years old
The product of two factors is 12.5. One factor is expanded four times and the other factor is expanded six times. What is the product
Let these two factors be a and B respectively
One factor is expanded by four times, and the other factor is expanded by six times, that is, 4A * 6B = 24ab = 12.5 * 24 = 300
The average score of Chinese and mathematics in Xiaoming's final exam is 96. The average score of Chinese and English is 93. The average score of mathematics and English is 95. How many scores of Chinese, mathematics and English
(Chinese + Mathematics) / 2 = 96.5
(English + Mathematics) / 2 = 95
(Chinese + English) / 2 = 93.5
Add the three to get Chinese + English + Math = 386
Then subtract Chinese and math (96.5 * 2) to get English = 93
And then you can figure out that math is 97
Language = 94
13. When a group speculates in stocks, it owes money to the bank at the rate of doubling every day. On the third day, it owes 12 million to the bank
On the seventh day, the amount owed to the bank was () 0000
14. A and B start to run around the wall at the same time from the diagonal vertex of a square wall with a circumference of 224 meters (as shown in the figure). A runs 7 meters per second, B runs 5 meters per second. After () seconds, when a sees B for the first time, it takes () seconds for a to catch up with B
15. A base is equipped with a and B emergency helicopters to carry out rescue tasks in mountainous areas. On a certain day, a helicopter flies to a place at a speed of. 400 km / h, and B helicopter flies to a place at a speed of 300 km / h. a helicopter arrives 0.5 hours in advance, and B helicopter arrives 0.5 hours late. The flight distance between the base and a place is () km
13. Let's ask for the money for the first day
Because "double every day", the third day is 2 × 2 = 4 times of the first day
The seventh day is the first day of 2 × 2 × 2 × 2 × 2 = 46
The first day's fund is 1200 △ 4 = 300
The seventh day fund 300 × 46 = 25800
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