There are x male teachers.
2/5=x/35
x= 14
Male teacher 14.
2. Prepare a pesticide, in which the ratio of medicine to water is 1: 150.
① How many kilograms of medicine and water does it take to prepare 755 kilograms of this pesticide?
Suppose you need x kilograms of medicine.
x+ 150x=755
x=5
150x=750
It takes 5 kilograms of medicine and 750 kilograms of water.
(2) There are 3 kilograms of medicine. How many kilograms can this pesticide be matched?
3+3× 150=453
Can do 453 kilograms.
(3) If there is 525 kilograms of water, how many kilograms of medicine should be put in the preparation of this pesticide?
525÷ 150=3.5
It takes 3.5 kilograms of medicine.
3. There are 150 books in kindergartens in Le Tong, 40% of which are allocated to large classes, and the rest are allocated to small classes and middle classes according to the ratio of 4: 5. How many books are there in the small class and the middle class?
150×( 1-40%)=90
90×4/(4+5)=40
90×5/(4+5)=50
There are 40 small classes and 50 large classes.
4. Two workshops 150 people. If 50 people are transferred from the first workshop, the number of people in the first workshop is 2/3 of that in the second workshop. How many people are there in workshop 2?
Set the original x people in the second workshop.
(x 2/3+50)+x= 150
x=60
There are 60 people in the second workshop.
5. The price of a set of desks and chairs is 105 yuan, of which the price of chairs is 5/7 of that of desks. What's the price of this chair? (Answer with different knowledge)
The price of setting a table is X yuan.
x 5/7+x= 105
x=6 1.25
x 5/7=43.75
The chair is 43.75 yuan.
6. Maple Leaf Garment Factory received the task of producing a batch of shirts, and produced 600 pieces in the first five days, completing 40% of the task. According to this calculation, how many days will it take to complete this task? (Answer with different knowledge)
(600/40%)/(600/5)= 12.5
A * * * takes 12.5 days.
7. An airplane can use fuel for 6 hours. When the plane flies downwind, the speed can reach 1.500 km/h, and when it flies back, the speed can reach 1.200 km/h. How many kilometers can this plane fly at most?
Set the maximum flight time x hours and fly back.
1500x= 1200(6-x)
x=8/3
1500x=4000
This plane can fly up to 400 kilometers and will fly back.