Two two digit numbers are different from each other, for example: 12 * 63 = 21 * 36

Two two digit numbers are different from each other, for example: 12 * 63 = 21 * 36

12*42=21*24
12*63=21*36
12*84=21*48
13*62=31*26
13*93=31*39
14*82=41*28
23*64=32*46
23*96=32*69
24*63=42*36
24*84=42*48
26*93=62*39
34*86=43*68
36*84=63*48
46*96=64*69

There are two numbers a and B. the number a is not a multiple of number B, nor a divisor of number B, nor a coprime number. The least common multiple of two numbers is 126
If the number a is 9, what is the number B?

126 = 9 * 14
Let this number be 14
Then the number a is not a multiple of the number B, nor is it a divisor of the number B
Not satisfying two numbers is not coprime
So 14 needs to be multiplied by the common divisor of 9, 14 * 3 = 42
9 and 42 satisfy all the conditions

493 can be divided by 3 only by increasing () at least, by subtracting () at least, and by increasing () at least, it is a multiple of 2

493 at least increase (2) can be divided by 3, at least subtract (3) can have a divisor 5, at least increase (1) is a multiple of 2

Simplify the following ratios: 24:360.75:1 3 / 4

（1）2：3
（2）3：4
（3）5：6