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It is known that a and B start from two places respectively. It takes 10 hours for a to walk completely, and it takes 6 hours for B to finish the whole journey. When the two meet for the first time, according to the midpoint of 120 meters, the distance between a and B is calculated? You can't use equations,
When they met, B was 120 * 2 = 240 meters more than a
When Party A and Party B meet, it takes 1 / (1 / 10 + 1 / 6) = 15 / 4 hours
When meeting, B than a more line of the whole: (1 / 6-1 / 10) * 15 / 4 = 1 / 4
AB distance: 240 / (1 / 4) = 960m
Ask you a math problem, in fact, it's very simple, but I haven't done it for a long time, a little forgotten, come on~
After 6 / 7 is reduced to a decimal, what is the number above the 1993 digit after the decimal point?
Hello
6/7=0.857142857142..
So it's a cycle of 857142
1993 △ 6 = 332 + 1
So the number above the 1993 digit after the decimal point is 8
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Ask you a math problem, 111
There are 108 books on shelves a and B, and 140 books on shelves B and C. The ratio of books on shelves a and C is 3:7. How many books are there on shelf B?
Suppose there are 3x books on shelf a, then there are 7x books on shelf C (because the ratio of books on shelf a and shelf C is 3:7)
There are (108-3x) books on bookshelf B (because there are 108 books on bookshelf A and bookshelf b)
108-3x + 7x = 140 (because there are 140 books on shelves B and C)
4x=32
x=8
There are books on the shelf 3x = 3x8 = 24
There are 108-3x = 108-24 = 84 books on shelf B
There are 7x = 7x 8 = 56 books on shelf C
I hope I can help you
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