Question

sum of two number is 90.if greater numbrr exceeds twice the smaller by 15.find the numbers using one variable

Answer 1

Answer:
            Sum of two Numbers = 90
  Let the greater number be X.
      and Smaller Number be Y.

Therefore ,
             X = 2Y+15
Also , X+Y =90(Sum Of Numbers is 90)
       or 2Y+15+Y=90
      or 3y+15=90
     or 3Y =90 -15
     or 3Y =75
    or Y =75/3
    or Y =25
Hence Smaller Number is 25.
Therefore , greater Number(X) =2Y+15
                                            or X =2*25+15 
                                            or X =50+15 
                                            or X =65

Hope this helps you .

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Answer 2

given sum of 2 no.s  is 90
if one no. is x the other will be 90-x
if x is the greater no.
x= 2(90-x)+15
x= 180-2x+15
3x = 195
x = 195/3
   = 65
90-x = 90-65 = 25