If number a is a 2-digit number and its digits are transposed to form number b, then the difference between the larger of the two numbers and the smaller of the two numbers must be divisible by

a.8
b.7
c.9
d. an even number

The required numbers must be divisible by 9 .

Given that,

Number A is 2 digit number and its digits are transposed to form number B,

We have to find,

The difference between the larger of the two numbers and the smaller of the two numbers must be divisible by.

According to the question,

The 2 digit number is ab it has a value of

Larger of the two number = 10a+b

When it is reversed it will have a value of

Smaller of the two numbers = 10b-a ,

The difference between the larger of the two numbers and the smaller of the two numbers,

= 10a + b - 10b - a

= 9a - 9b

Divided by 9

= a - b

So, The numbers must be divisible by 9.

Hence, The required numbers must be divisible by 9 .

For more information about Difference of Number click the link given below.

link

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

pls mark as brainliest

answer: it's d

step-by-step explanation: