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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