9. 1x+0.2 = 1 1. 12

2.3(x-4)=27.6

x÷ 1.6=6.4×2.6

8.7 -3.4 times =5.406

8.5×2-8x= 15.4

7(x-2)= 3.5

2. Solve the equation.

(1) The sum of two adjacent natural numbers is 37. What are two natural numbers?

(2) 8 times a number minus the product of 4 and 12.5, and the difference is 0, so find this number.

Grandpa's age is six times that of Wenwen. Grandpa is 50 years older than Mingming. How old are Grandpa and Wenwen respectively?

4. A motorcycle travels from place A to place B, traveling at an average speed of 36.4 kilometers per hour to a place 2.7 kilometers away from the midpoint, then accelerating, traveling at an average speed of 40 kilometers per hour, and arriving at place B at the same time. How long did the motorcycle travel at an average speed of 40 kilometers per hour?

By analogy, we can apply innovation to show our talents!

Xiaowen and Xiao Fang went to the store with the same amount of money, Xiaowen went to 42 yuan and Xiao Fang went to 9 yuan. As a result, the money left by Xiaofang is just four times that of Xiaowen. How much money does Xiaowen and Xiao Fang have?

6. Grade five students go to visit the park. On the way, there is a river that needs to be crossed by boat. If each ship takes 10 people, there are still 4 people left. If each boat carries 12 people, there will be 1 boat. How many people in Grade Five went to Grade One?