Elimination Method of Finding Solution of a Pair of Linear Equations
Sevwn times a...
Question
Sevwn times a two digit no. Is equal to four times the no. Obtained by reversing the digits .if the difference of the digit is 3 ,determine the no.
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Solution
Seven times a given two digit number is equal to four times the number obtained by inter changing the digits 7(10x+y)=4(x+10y) 70x+7y=4x+40y 66x-33y=0 2x-y=0 2x=y The difference of the digits is 3 y-x=3 2x-x=3 x=3 y=6 that number is 36.