Set of operations is being done on a number A

I)A is multiplied by 5 to get B

ii) 5 is added to be to get C

iii) tennis subtracted from C to get D

iv) 1 is subtracted from D to get 9

Find the value of A

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Solution

A5=B----(1)

5+B=C----(2)

C-10=D---(3)

D-1=9

=>D=9+1
=10
sub D in (3)

C=D+10=10+10
=20
Sub C in (2)
5+B=C

B=C-5=20-5
=15

5A=B

=>A=B/5=15/5
=3

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