12a=8(a+25)
? 12a=8a+200
4a=200
a=50
If the speed is 50 kilometers per hour, then the distance is 12×50=600 (kilometers).
A: The distance between A and B is 600 kilometers.
2.2000/5=400 (plants)? A: There are 400 willows and 400 peach trees by the lake.
3. Solution: Let Celsius be X degrees, then Fahrenheit is (x+60).
9/5x+32=x+60
? 9/5x=x+28
? 4/5x=28
x=35
A: It's 35 degrees Celsius.
4. The lottery number consists of any three numbers from 0 to 9 (repeatable), such as 000 or 326. If the selected number is the same as the winning number, the lottery winner wins the prize, and the bonus is 1000 yuan. Someone buys lottery tickets, please analyze the possibility of winning. If a person must win the lottery, how much does it cost at least? (2 yuan in each lucky draw)
Numbers range from 000 to 999, and there are 1000 * *. If you buy one, the winning probability is11000.
If you want to win the prize, you have to buy it all. Need 1000× 2 = 2000 yuan.