the 9 times of the two digit number is equal to 2 times of that reverse number.the sum of that number is 9?

• Number is 18
  
  If number with two digits x & y is 10x+y, then 9(10x+y)=2(10y+x) or y=8x
  As sum of the digits of a number=9, so for x=1, y=8
  So the number=10*1+8=18
• 8 years agoHelpfull: Yes(18) No(0)
• 18 is correct answer i too got
• 8 years agoHelpfull: Yes(2) No(0)
• that two digit no is =18....
  x+y=9
  9(10x+y)=2(10y+x)
  on solving eqns
  x=1,y=8.. no is 18
• 8 years agoHelpfull: Yes(2) No(0)
• number is 18
• 8 years agoHelpfull: Yes(1) No(0)
• Number = 18
  
  Let digits be x & y
  Hence number is 10x + y
  given 9*(10x + y)=2*(10y+x)
  And x + y=9
  On solving we get x=1 & y=8
  Hence number is=18
• 8 years agoHelpfull: Yes(1) No(0)
• hi frnds,yesterday rectangle form panra question ans 13.......... is it correct or not
• 8 years agoHelpfull: Yes(0) No(2)
• Rectangle problem. Ans must be 12or 13. Am not sure aswini
• 8 years agoHelpfull: Yes(0) No(2)
• answer 13 only bcz if u r consider both square and rectangle means answer will be 18
  but here only rectangle only asked so answer is 13
  
• 8 years agoHelpfull: Yes(0) No(2)
• me too marked as 18... but am not sure...
• 8 years agoHelpfull: Yes(0) No(0)
• yr ans s 4 abv ques r for d rectangular ques@mr.salan sai
• 8 years agoHelpfull: Yes(0) No(1)
• two equations are :-
  1:- 9(10x +y) =2(10y + x)
  2:- x+y=9
  onsolving we get =18;
• 8 years agoHelpfull: Yes(0) No(0)
• the ans. is 18
  
  assume that the given number is xy
  given that x+y=9.........(1)
  9(10x+y)=2(10y+x)
  by solving this we get y=8x substitute this value in (1) then we get x=1 and y=8
  so,the answer is 18
• 8 years agoHelpfull: Yes(0) No(0)
• let the number be = x
  Let other number be = y.
  Reverse of first = 10x+y.-----1.
  Reverse of second = 10y + x.-------2.
  Sum of that numbers is = 9= x+y = 9.—3.
  Now, equate 1 and 2, as per condition given:
  9(10x+y) = 2(10y + x)
  90x +9 y = 20y + 2x.
  90x -2x = 20y – 9y
  88x = 11y.
  Y= 8x.-----4
  Substitute equation 4 in equation 3.
  X + 8x = 9
  9x = 9.
  X = 1.
  Y = 8* 1 = 8.
  Now, sum of both x and y = 1+ 8 = 9.
• 9 Months agoHelpfull: Yes(0) No(0)