It's 80. if that's not right, then the sequence wasn't explained correctly.
78
Do-it-in-your-head method: 90 - 12 = 78; 78/2 = 39 which is your lower number, making the other number 51. Shazam!
There seems to be a number missing between 78 and 213. Please check and resubmit.
78
12% of $78 is 9.36work: 78x .12-------156+ 78-------9.36
110
91
91
42 is the next number in this sequence. This number sequence is adding the next prime number to the last number. So 1 + 2 = 3. Then 3 + 3 = 6, 6 + 5 = 11, 11 + 7 = 18, 18 + 11 = 29. The next prime number after 11 is 13, so 29 + 13 = 42. The next numbers would be 59 (42+17), 78 (59+19), and 101 (78+23)
100
The next perfect square after 78 is 81 (±92).
78,72,66,60,54 what is the next number
4-7 __7-13__ 13-25 __25-39 __39-78+3 ___+6___ _+12____+24____+39___+3 ___+6____ +12 ____+24_____+3____ +6 _____+12________+3_____ +6
78
The next number is 20.
Do-it-in-your-head method: 90 - 12 = 78; 78/2 = 39 which is your lower number, making the other number 51. Shazam!
The next two numbers are 26 & 78.