12, 10 and 15 the are alternatively increased by 2 and 3
42 123 243
27, 33, and 39. The pattern adds 6 each time
6, 15, 24, 33, 42, 51, 60
The next number is 30. The numbers are increasing in multiples of 5.
The Next NumberThe next number is 25 if you use the following pattern: 5, (the number 10), 15 (the first number +10), (the number 10), and the next number is the third number +10 or 25.or you could think of it this way:5, 10 (+5), 15 (+5), -5 (10)The pattern is +5, +5, -5, so the next number would be 15, the next 20, and the next 15.
5+5 = 10 10+5 = 15 15-5 = 15 10+5 = 15
12, 10 and 15 the are alternatively increased by 2 and 3
The numbers are halving each time, so the next three are 60, 30 and 15.
42 123 243
5
45
27, 33, and 39. The pattern adds 6 each time
6, 15, 24, 33, 42, 51, 60
The next number is 30. The numbers are increasing in multiples of 5.
15, 21 (the triangular numbers)
11, -10, 9