The quotient of 8 times of a number divided by 20 is 2.72. Find the number and solve it by equation

The quotient of 8 times of a number divided by 20 is 2.72. Find the number and solve it by equation

Let this number be X
8x÷20=2,72
8x=2.72*20
8x=54.4
x=6.8
This number is 6.8
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The sum of eight times of a number and one fourth of it is 66. Find the number

66 / (8 + 1/4)
= 66 / (33/4)
= 8

The sum of 8 times of a number and its 1 / 2 is 102. What is the number? (solution of the equation)

Let the number be X
8x+1/2x=102
x=102/8.5
x=12

What's the difference between the quotient of 22 divided by 4 minus six times of 0.2? 84 1 / 7 are less than 25% of a mature one by six. Find this number

22÷4-0.2×6=5.5-1.2=4.3
Let this number be X
25%x-84*1/7=6
25%x-12=6
25%x=18
x=72
A: the number is 72