4.8 is the average.
the answer of the average of 42, 57, and 63 is 54.
It is: 47+52+63+66 = 228/4 => 57 which is the average mean
-57 + 63 = 6
63
21. The number subtracted doubles in each succession... 63 is 3 less than 66... 57 is 6 less than 63... 45 is 12 less than 57. So 21 is 24 less than 45.
It is: (63+57)/2 = 60
one.
The Least Common Multiple (LCM) of 63 and 57 is 1,197.
63
19 + 24 + 20 = 63/3 = 21 The average of the three numbers is 21.
(57 x 63) + 28 = 3619
57 x 63 + 28 = 3619