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The examiner may be assessing your cognitive ability. If you can't do it then you may be impaired or have trouble reasoning.
7 14 21 28 35 42 49 56 63 70 77 84 91 98 105 ....
If you mean 7/20 of 100 then it is 35
If you mean 7/100 then it is 0.07
In principle, you can count backwards; or use some shortcut (such as calculating the number of days, dividing by 7, and obtaining the remainder).