Difference 7548

The difference between every two adjacent numbers equals three in a series of four numbers. The sum of these numbers is 60. Specify these numbers.

Correct answer:

a =  10.5
b =  13.5
c =  16.5
d =  19.5

Step-by-step explanation:

a+(a+3)+(a+6)+(a+9) = 60

4a = 42

a = 42/4 = 10.5

a = 21/2 = 10.5

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