We all know that an onion is at least a combination of onion and onion, so if he buys 50 kilograms of onion and onion, it is equivalent to buying only 50 kilograms of onion, then (0.3+0.7)X50=50, of course, only 50.
Three days during the day and two nights at night are equivalent to climbing only one meter a day, so I climbed five meters the next night, and on the sixth day I climbed three meters during the day, so I climbed to the top on the sixth day.
4 1 yuan buys 10 peaches, so there are 10 cores, one for 3 cores.
So 10 can be changed to 3.
I have three 1.
At this time, you only have two cores that you can't change.
So a * * * can eat 10+3+ 1= 14.
5 just want to give a part. . .
For the first time, divide into three piles, take two pushes at will. When the weight is the same, the one with different weight must be in the remaining pile.
The second time, if the weight is the same, take two of the remaining four balls to match.
The third time, choose one of these two to match one of the other two. If it's the same, the difference is the last one. If it's called difference, it's the one you choose.
9 44 Because first, let's look at the multiples of1122 33 44 55 and so on.
Because it is a multiple of three, it is characteristic that the sum of digits cannot be a multiple of three, so part of it can be excluded.
Because multiples of 5 can't be 5 and 0, I can exclude some, so I didn't see 7 9 at all.
Starting with 1 1 22 33 44 55 66, let's look at 5 first. After excluding a few, only 44 are suitable, so forget it.
10 Because the least common multiple of 2 1 and 28 is 84, if forks and spoons are added to 3 yuan, knives are added to 4 yuan.
Then you need at least one set from 84 yuan to 7 yuan, so you can buy 12 sets for one * *.
So buy 12 sets of knives and forks.