Find the missing number
A sequence of numbers follows a certain rule:
3, 6, 11, 18, 27, ? , 51
What number should replace the question mark?
A box of biscuits
A box of biscuits contains 36 biscuits. 20 biscuits have foil wrappers. 15 are chocolate biscuits with foil wrappers. If 9 are not chocolate and do not have a foil wrapper, then how many chocolate biscuits are there?
After analysing this sequence, we can deduct that the pattern is just adding by 2 more than the previous number.
ReplyDelete3 + 3 = 6
6 + 5 = 11
11 + 7 = 18
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First, we add 3, then add 2 to this so we can add 5 and then 7.
Therefore, we must add 11 to 27 as we added 9 before to get from 18 to 27.
11 + 27 = 38, which is our answer