A.54 B.67 C.49 D.34
Example: Teacher Wu gives each Class A four blank sheets, each Class B three blank sheets, * * * 7 16 blank sheets; If you give each class A three blank sheets and each class B four blank sheets, then you will give * * * 705 blank sheets. How many people are there in the two classes?
1 17
Two barrels of wine came in from this shop. Large barrel120kg wine, small barrel 90kg wine. After two barrels sell the same amount of wine, the remaining wine in the big barrel is just four times that in the small barrel. How many kilograms of wine are left in the two barrels? ()
10
Students go boating in the park in spring. If there are three people on each of the five boats and the other four people take a boat, there are five people who have no boat to take; If there are six people on each of the four boats and three others take the boat, the last boat will be empty. Q: How many ships are there? ()
A.7 B.9 C.36 D. 18
The road from a to b is only uphill and downhill, and there is no smooth road. The speed of the car is 20 kilometers per hour when going uphill and 35 kilometers per hour when going downhill. It takes 9 hours to drive from A to B and 7.5 hours from B to A Q: How many kilometers is the expressway between A and B? ()
250 C.200 D.2 10
The distance difference at the beginning of the analysis is 9, and how many meters it takes to catch up with the rabbit, so it must be a multiple of 9, and only A meets it.
Two kinds of situation analysis add up to seven copies? The total number of students in two classes? . So (7 16+705)/7=203.
Analysis shows that the wine left in the vat is just four times as much as the wine left in the small bucket, so the wine left in the two barrels is a multiple of 5, and 50/5= 10, which is just an integer. Give priority to substitution and choose D.
Analysis according to the equal number of people, set up X ships, then 5? 3+(x-5)？ 4+5=4? 6+(x-5)？ 3, X=9, choose B.
In fact, the analysis can be regarded as taking an AB at the speed of the upper slope or an AB at the speed of the lower slope, so only 2 10 in the option can be divisible by 35, so D is selected.