57+97+37+47+6 = 244
40 + 57 + 40 + 30 + 47 + 31 + 60 + 38 + 64 + 30 + 120 = 557
Let's do 33 - 57 first. Since 57 is clearly larger than 33, we must go into the negatives. 33 - 57 = -24. Now add -24 to 47. It's just like subtracting 47 - 24. The answer is 23.
362. Next time, just use a calculator.
31 37 41 43 47 53. (29 is also prime).
The mean is 47.
27, 57, 77, yes. 37, 47, 67, no.
57
57
57 is the only one evenly divisible by 19 (or 3) ...and the other three are prime numbers
18
27, 57, 77, yes. The rest, no.
60.get calculator
37, 41, 43, 47, and 53
27, 57 and 77 are composite.
40 + 57 + 40 + 30 + 47 + 31 + 60 + 38 + 64 + 30 + 120 = 557
25+32=57
Let's do 33 - 57 first. Since 57 is clearly larger than 33, we must go into the negatives. 33 - 57 = -24. Now add -24 to 47. It's just like subtracting 47 - 24. The answer is 23.