6x+ 15y=360 1
8x+ 10y=440 2
X=60-5/2Y 3 from 1.
Substituting 3 into 1 gives 8(60-5/2y)+ 10Y=440.
480-20y+ 10y=440
- 10y=-40
y=4
Substituting Y=4 into 3 gives X=60- 10=50.
So each train carries 50 tons of leather and each car carries 4 tons.
2. Let's buy X tickets for Class A and Y tickets for Class B, according to the meaning in the question.
X+Y=35
24X+ 18Y=750
X=20 as above.
Y= 15
So buy 20 class A tickets, 15 class B tickets.
3. The number of people going to Yunshui Cave is X, and the number of people going to Huagongling is Y.
X+Y=200
Y=2X- 1
X=67 as above.
Y= 133
So there are 67 people in Yunshui Cave and 133 people in Huagongling.