Question

given should replace the questions mark 10 19 31 46 64 ?

Answer 1

See the pattern:

19 - 10 = 9

31 - 19 = 12

46 - 31 = 15

64 - 46 = 18

The number which is added to get the next number is increasing by 3.

So for next number, we will add = 18+3 = 21

21 will be added to 64

Next number = 64 + 21 = 85

Answer 2

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See the pattern:

19 - 10 = 9

31 - 19 = 12

46 - 31 = 15

64 - 46 = 18

The number which is added to get the next number is increasing by 3.

So for next number, we will add = 18+3 = 21

21 will be added to 64

Next number = 64 + 21 = 85