10.5-5=5.5 yuan 5.5/(0.5x2)=5.5 hours 5.5+ 1=6.5 hours.
A: This car has been parked for 6.5 hours.
Let the number of cups broken by Xiao Wang be x.
(300-x) × 0.04 is the money that can be received when all of them arrive safely, minus 0. 16X is the money that Xiao Wang actually received.
(300-X)×0.04-0. 16x = 1 1.2
Solution 12-0, 2x = 1 1.2
0.8 = 0.2 times
x=4
Xiao Wang * * * broke four cups.
There should be only two possibilities. . . . His topic doesn't seem very clear. . . .
One is that if Xiaoming's height is 1.2M, the price of a full ticket is X yuan. (There are two adults who are both tickets, and Xiaoming's is 0.5x)
2X+0.5X=7
X=3
Second, Xiaoming's height exceeds 1.2M: the full fare is X yuan. (Even if it is Xiao Ming's, it should be calculated according to the whole ticket. )
3x=7
x=2.5
A: There are two possibilities. If Xiao Ming's height does not exceed 1.2m, all tickets are for 3 yuan. If Xiao Ming is over 1.2m, the full fare is 2.5 yuan.
(You can also interpret it this way. If Xiaoming's increase is 1.2m, then it is 7÷2.5=3, which means that each piece is Yuan (Xiaoming's half piece is 0.5).
If: If Xiaoming is over 1.2m, it means that he has bought three tickets (7÷3=2.5 is 2.5 yuan).
4. The weight of a cup of water with a kettle is 330g, and that of four cups of water with a kettle is 780g. If you subtract 330g from 780g, you will get the weight of three glasses of water without a kettle. Divide 450g by 3 to get the weight of a glass of water, and leave 2 to get the weight of two glasses of water.
780-330 = 450g 450 ÷ 3 =150g150× 2 = 300g
Answer: The weight of two glasses of water is 300 grams.
Suppose: the money for each table is X yuan. The money for which chair is X x-16.7 yuan.
The equation is 5x+7x (x- 16.7) = 305.5.
12x- 1 16.9 = 305.5
12x=422.4
x=35.2
The money for the chair is 35.2- 16.7 = 18.5.
A: 35.2 yuan per table, chairs 18.5 yuan.
==|| 。 . I forgot what problem-solving methods I learned in the fifth grade, so I can give you some lessons. It shouldn't be wrong. . . .