Solution: Suppose that X people get 2 and (26-x) people get 5.
2x+5(26-x)= 100
2x+ 130-5x= 100
2x-5x= 100- 130
-3x=-30
x= 10
So 26-x= 16 (person)
A: Two cards 10 people and five cards 16 people.
(2) A truck can transport coal 20 times a day in sunny days and 12 times in rainy days. It has been transported 1 12 times for eight consecutive days. How many days has it rained these days?
Solution: If X days are rainy, then there are (8-x) days of sunny days.
12x+20(8-x)= 1 12
12x+ 160-20x = 1 12
12x-20x = 1 12- 160
-8x=-48
x=6
So 8 x = 2 (days)
A: There are 6 rainy days and 2 sunny days.
The centipede has 40 feet, and the mantis has 6 feet. At present, there are 60 centipedes and mantissa, totaling 1720 feet. How many centipedes and mantissa are there?
Solution: If there are x centipedes, there are (60-x) mantissas.
40x+6(60-x)= 1720
40x+360-6x= 1720
40x-6x= 1720-360
34x= 1360
x=40
So 60-x=20 (only)
Answer: There are 40 centipedes and 20 mantissas.