self Maths Puzzle

what is the next number?
15,28,42,58,80

Read Solution (Total 2)

28-15 = 13
42-28 = 14
58-42 = 16
80-58 = 22
|13 - 14| = 1
|16 - 14| = 2
|22 - 16| = 4
next in the sub-sequence = 8
increment = 22 + 8 = 30
next in series = 80 + 30 = 110
12 years agoHelpfull: Yes(2) No(1)

differences is
28-15 = 13
42-28 = 14
58-42 = 16
80-58 = 22
|14 - 13| = 1
|16 - 14| = 2
|22 - 16| = 6
so 1*2=2
2*3=6
3*4=12
increment = 22 + 12 = 34
next in series = 80 + 34 = 114
12 years agoHelpfull: Yes(0) No(0)

self Other Question

There are 5 apples (same shape and size) and 3 bananas (same shape and size). How many combination can be made from these fruits?
The distance between two stations is 100 km. 2 cars start from A and B at the same time and return to the original station with speed 48 km/hr and 100 km/hr. Find the time gap between their two meetings.