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# Quantative aptitude problems

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 RishebhKumar Student [ Scorecard : 84] Posted On 12 May 2012 at 23:31 Q1.the sum of a digit of a two digit number is 10.If 18 is subtracted from it the digits in the resulting number will be equal.the number is .........?   Please teach me how to solve this.... thanks Member (Account Deleted) Service [ Scorecard : 774] Posted On 13 May 2012 at 01:41 answer is 73. 7+3=10. 73-18=55 intermediate(ipc)course no [ Scorecard : 1446] Posted On 13 May 2012 at 07:54 let two digits are X & Y AS PER QUESTION, X + Y = 10 ---------------------------(1) X - 18 = Y OR, X -Y = 18 -----------------------(2) AFTER SOLVING THIS EQUATION, U GET, X = 14 & Y = -4. Tejaswi Kasturi student-cpt [ Scorecard : 402] Posted On 13 May 2012 at 09:27 check this link out the answer is extensiively discussed here Raja Panduranga CA, CS Manager - Finance [ Scorecard : 566] Posted On 13 May 2012 at 09:30 Let x = 10's digit of a two digit number Let y = units digit Let z = the resulting equal digits : Write an equation for each statement: : "the sum of a two digit number is 10." x + y = 10 or y = (10-x) : " if 18 be subtracted from it, the digits in the resulting number will be equal." 10x + y - 18 = 10z + z 10x + y = 11z + 18 : Substitute (10-x) for y 10x + (10-x) = 11z + 18 10x - x = 11z + 18 - 10 9x = 11z + 8 : The single digit integer values for x and z are limited to x=7 and z=5 in this equation: x = 7, y = 3, z = 5 : The number is 73 : Check in the statement: "if 18 be subtracted from it, the digits in the resulting number will be equal." 73 - 18 = 55

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