32 * x+4 1 *( 1/2-x)= 17.8
x=0.3
So it takes 0.3 hours to go up the mountain and 0.2 hours to go down the mountain.
This item seems to be incomplete. Without the total number of bottles, it can be said that none of them are broken. Please see if there is any omission in this item.
3. If there are ***x students, there are x rice bowls, x/2 vegetable bowls and x/3 soup bowls.
x+x/2+x/3+3=80
x=42
So * * * has 42 students.
4. There is something wrong with the topic. Is there something wrong? There are 20 words in five-character quatrains and 28 words in seven-character quatrains. No matter how many poems there are, the difference between words is always even, not odd. Change 5 to 4, and the process is as follows:
If there is a five-character quatrain X, then there is a seven-character quatrain x- 13.
5*x*4+4=7*(x- 13)*4
x=46
5. Set X spider, Y dragonfly, 16-x-y cicada.
8 * x+6 * y+6 *( 16-x-y)= 1 10
2*y+( 16-x-y)= 14
Make up the equation and get x=7.
y=5
16-x-y=4
So there are seven spiders, five dragonflies and four cicadas.