Riddles: In a new hotel containing 100 rooms, Tom was hired to paint the numbers from 1-100 on the doors. How many times will Tom have to paint the number 8?

11

Step-by-step explanation:

8

18

28

38

48

58

68

78

88

98

20 times

Step-by-step explanation:

To know the number of times Tom will pain the number 8, let determine the numbers of 8 between 1 an 100.

The number of 8 between 1 and 100 is shown below:

8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89 98.

From the above illustration, the number 8 appears 20 times (note 88 has two 8)

Therefore, Tom will pain the number '8' 20 times

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

what are you trying to solve here

step-by-step explanation: