2, we use addition to combine the rate to see
Scallion a pound, buy 100 pounds, so 1 × 100 = (0.7 + 0.3) × 100 = 70 + 30 = 100
If the white onions and green onions to buy separately, then the white onions 70 cents, then the green onions, the green onions, the green onions, the green onions, the green onions. Then 70 cents for the white onion, 30 cents for the green onion, 50 pounds of white onion, 50 pounds of green onion, so 0.7×50+0.3×50=
(0.7+0.3)×50=1×50=50, which is half as cheap as if you sold them together. So if you sell them separately, the price goes up twice as much.
3. It took 5 days
Because the snail climbed 3 meters during the day and fell 2 meters at night every day, and together it climbed 1 meter a day, it climbed 4 meters in 4 days. On the fifth day the snail climbed 3 meters during the day and came out of the well, so it would not sink, so it took 5 days
4. The pile of coconuts had at least 15621
The first man gave 1 to the monkey and hid 3124, leaving 12,496;
The second man gave 1 to the monkey and hid 2,499, leaving 9,996;
The third man gave
The third person gave 1 to the monkey, and hid 1,999, leaving 7,996;
The fourth person gave 1 to the monkey, and hid 1,599, leaving 6,396;
The fifth person gave 1 to the monkey, and hid 1,279, leaving 5,116;
At last, they all joined together to divide it into 5 portions of 1,023 each, with 1 extra, and gave it to the monkey.
5.
For the sake of convenience, let's write down the big, small and medium-sized islanders as ABC (actually none of them used C)
The first question asked A:Is the treasure on the mountain?
The second question asks B:Did A get it right?
The third question asks B:1+1=2 right?
Okay, now we don't know if A answered "yes" or "no" to the first question, or if A answered true or false, but we just know if A raised his hand left or right, so let's ignore him for now.
Looking at the second question, regardless of whether A's answer means "yes" or "no", as long as A's answer is correct, B also answered correctly in the second question, so he should answer "yes". "(if he can speak Chinese).
It doesn't matter whether A's answer is "yes" or "no", as long as A's answer is wrong, B's answer in the second question is also wrong, so he should still answer "yes". ".
So no matter what the case B raised that hand is "yes" meaning;
The third question: now know what the left and right hand means, then as long as you know B just answer is true or false, can determine A is true or false, because they are two of the true or false must be the same. So just ask a random question, like 1+1=2 is it?
6. Let this room have x tables and y people.
3x+2=y
5x+4=y
7x+6=y
9x+8=y
11x=y
Associating the five equations
Solve: x=229 y=2519
Answer: there are 2,519 people in this room, and there are 229 tables.
7.
Set the forks, spoons, knives, respectively, and sell them for abc
There are P dollars on hand
Then p=21a+21b
p=28c
So
28c=21a+21b
The transformation gives
49c=21(a+b+c)< /p>
a+b+c=7/3c
And again
n(a+b+c)=p
n(7/3c)=p=28c
n=12
You can sell 12 sets~!
8. Well, I'll give you a few more answers,
Answer 1: The river was so shallow that the thief dribbled right through it. (Because you didn't say how deep the river was, just that he was 12 meters long)
Answer 2: There was a bridge over the river, and the thief ran across it (you didn't say whether there was a bridge)
Answer 3: There was a boat parked on the river, and the thief paddled across it (you didn't say whether there was a boat)
Answer 4: The thief was in fact a Phelps, and swam across it (you didn't say whether the thief could swim)
Answer 5: The thief was in fact a Phelps, and swam across it (you didn't say whether the thief could swim or not). )
Answer 5: An axe was placed next to the tree, and the thief chopped down the book to make a bridge across the river (you didn't say whether there was an axe)
Answer 6: The thief tore the scarf vertically into three sections so that the three six-meter tied together is twelve-meter, and then threw it to the other side of the bank to figure out how to tie it securely, and then dribbled across the river.
Answer seven ......
Want me to go on?
Okay, okay, since you're all in a mindset, I'll just reason the answer as given. First, first hint, the tree is losing all its leaves. Second hint, the thief was wearing a scarf. What does this mean? It means it was cold. It was winter! So, the answer is simple. The river had frozen over and was frozen, and the thief ran straight through the ice