"I don't know what to do today, and there are two left in three or three; Five and five have three left, and seven and seven have two left; Ask geometry? "

I'll answer it

simith666

Lv.2019-12-17 call

A number divided by 3 is more than 2, divided by 5 is more than 3, and divided by 7 is more than 2. What is it? The answer is: 23 or n times 23.

Source: 4th and 5th centuries, unknown author.

Today, there are unknown things. There are two left in three, three left in five, and two left in seven and seven. What is the geometry of things? Answer: Twenty-three

At present, a thing doesn't know its quantity. It leaves two for every three numbers, three for every five numbers and two for every seven numbers. What's this number? A: Twenty-three.

Analysis: where 70 is the number 1 divided by 3 in the common multiple of 5 and 7; 2 1 is the number of 1 divided by 5 in the common multiple of 3 and 7; 15 is the common multiple of 3 and 5 obtained by dividing the number 1 by 7. 105 is the least common multiple of 3, 5 and 7. If the number is large, you can subtract 105 continuously. Accordingly, the above problems can be expressed as: 70× 2+21× 3+15× 2 = 233,233-105 = 23.