Answer :

(a) 7A – 16 = A9


Solve this equation by using the numbers from 0,1,2…… in A


Finally, 5 solves the equation as


75 – 16 = 59


Hence, A is 5


(b) 107-A9 = 1A


Solve this equation by using the numbers from 0,1,2…… in A


Finally, 8 solves the equation as


107-89 = 77


Hence, A is 77


(c) A36 – 1A4 = 742


Solve this equation by using the numbers from 0,1,2…… in A


Finally,9 solves the equation


936-194 = 742


Hence, A is 9


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