1/x+ 1/y = 1/ 12
10/x+ 15/y= 1
Do the math yourself
4. There is a project, which took team A 15 days to complete and team B/20 days to complete .. After a few days of cooperation between team A and team B, team A stopped for a few days before continuing to do it. Results/kloc-finished the task in 0/2 days. How many days will Team A stop working?
12 *( 1/ 15+ 1/20)- 1 = x/ 15
Party A and Party B produced a batch of parts together, and it took 20 days to complete the task, but Party B took five days off on the way. It is known that Party A makes three more parts than Party B every day, and the parts made by Party B are exactly half of those of Party A. Find the total number of these parts.
20*(x+3)=2* 15*x
20*(x+3)+ 15*x=y
6. There are 180 apples in three baskets. If a third of the apples in the second basket are put in the first basket and a quarter of the apples in the third basket are put in the second basket, then the number of apples in the three baskets is the same. How many apples are there in each basket?
Push back, the last three boxes are all 60.
7. Dad bought a piece of glass 2 meters long 1.3 meters wide. I want to cut the window glass into 5mm and 4mm widths. How to cut to avoid waste?
13, just draw a picture yourself, 1.3=4+4+5.
8.20 squares with a side length of 8 cm are connected as shown in the figure, and the connection point is the center of the previous square. Find the perimeter of the connected graph.
Where are the photos?
9. The area of the diamond is 48 square centimeters, and the ratio of the length of the two diagonal lines is 2: 3. Find the length of the diagonal.
I don't remember,
It seems to be 48/(1/2 * 2 * 3) = the square of X.