On the way, Lao Zhang stopped 1 hour, which is equivalent to Xiao Wang working ahead of schedule 1 hour.
1× 1 = 1.
The cooperation between the two is completed.
1-8 points 1 = 7 points and 8 points.
The cooperation completion time is
7/8 (1+6/8 1) = 3 (hours)
Xiao Wang called.
1+3 = 4 (hours)
2. There is a column number of 2, 5, 8, 1 1, 14 ... According to this rule, which number is 104?
The last number is 3 more than the previous one.
104 is the first in this column.
(104-2) ÷ 3+ 1 = 35 (pieces)
There is a man who is all dogs, and his birthday is March 20th. In a certain year, the product of their ages is 207025, and the sum of their ages is 102. What is a?
207025 = 5×5×7×7× 13× 13
Combine these factors into various age groups.
The age difference of these people is a multiple of 12.
So it's 13,13,25,49.
But these add up to =13+13+25+49 =100.
We're two people short.
Use 1 And 13- 1= 12.
So there are six people, and their ages are 1, 1, 13, 13, 25 and 49 respectively.
a=6 .