A number is to be multiplied by the fraction 4/5.But amit, by mistake multiplied it by 5/4 and obtained the number 81 more than the correct value.what was the original number?
a, 200
b, 240
c, 180
d, 120

• anser is c 180. let the no. be x.
  x*5/4 - x*4/5 =81. solving this we get 180
• 9 years agoHelpfull: Yes(18) No(1)
• x= 180
  we get by solving this
  (5/4)x-(4/5)x= 81
• 9 years agoHelpfull: Yes(3) No(5)
• answer is c 180
  let no. be x
  then eq will 4/5*x=y
  bt eq made amit is 5/4*x=y+81
  putting value of y in eq 2 we will get the as x=81*20/9=180
  so answer is 180
• 9 years agoHelpfull: Yes(2) No(0)
• ans>180
  
  180*4/5=144
  180*5/4=225
  
• 9 years agoHelpfull: Yes(2) No(1)
• C. 180
  LET ORIGINAL NO. BE x.
  then eq will be 4/5*x=Y
  but mistake fuly answer will be- 5/4*x=y+81
  equality the eq: me get x=180
• 9 years agoHelpfull: Yes(1) No(0)
• let d no z =x ,
  4/5x=y
  5/4x=y+81
  solving dis two equ ll get x=180
• 9 years agoHelpfull: Yes(0) No(0)
• answer is :- option c i.e. 180
• 8 years agoHelpfull: Yes(0) No(2)
• 81+num*(4/5)=num*(5/4)=from this equation we get num=180.
• 5 years agoHelpfull: Yes(0) No(0)
• let the number is x
  81+(x*(4/5))=x*(5/4)
  => x=180
• 2 years agoHelpfull: Yes(0) No(0)