Logic behind this question

#1

Let x = a5 + b11 , where a>0 and b>0.

What is the largest value of x that can not be made?

sir I am unable to get the concept behind it.

#2

Hello @Ankit_kumar_3003,

The numbers given are
39
35
51
41

51 can be made like: 8 5+1 11
41 can be made like: 6 5+1 11
35 and 39 can’t be made like a 5+b 11, so largest number that can’t bee made like a 5+b 11 is max(35, 39) viz 39

#3

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