Sorry, my bad.
The given answer was 69 (option E). My son had marked Option A.
I was working on the same thing as writing them alphabetically as
Eight
Eighteen
Eighty-eight
Eighty-five
Eighty-four.... and so on but that sounded too difficult
I will post a picture as well. Here is the picture. It is Q 56

solimum wrote:
Not sure whether this is meant to be a maths question but to me it seems ambiguous.
Are they looking for the numbers written as words, ie
one
two
...
ninety-nine
in which case my first response would be that obviously ninety-nine is not going to stay as the last one, it will be twenty-two (??)
So if you're putting the numerals in alphabetical order, I presume they mean (like on those drop-down with addresses when you put your postcode in....) look at the first digit, then order by the second digit, repeat for each 1st digit
1
10
11
12
13
14
15
16
17
18
19
2
20
21
....
9
90
91
.
.
.
99
However looked at like that, all the numbers in the 90s are in the same place, as is 1, so the answer given is not unique
Any other interpretations?