CAT Exam

The ratio between a two-digit number and the sum of the digits of that number is 4 : 1.If the digit in the unit's place is 3 more than the digit in the ten’s place, what is the number?

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Ans : 36
Let x be the 10's place digit and y be the units place digit.
Then the no. is 10x+y
The ratio b/w the no. and the sum of the digits is (10x+y)/(x+y)=4
On simplifying we get,y = 2x ....(1)
Also given y = x+3 ....(2)
Substituting (1) in (2) we get, 2x = x+3 => x = 3,y = 2*3 =6
Therefore the no. is 10x+y = 10*3+6 = 36
11 years agoHelpfull: Yes(1) No(0)

The number is 36.
11 years agoHelpfull: Yes(0) No(1)
The number is 36.
11 years agoHelpfull: Yes(0) No(1)
The number is 36.
11 years agoHelpfull: Yes(0) No(1)
let digit is xy then
10x+y/x+y=4/1
and y=x+3
it gives x=3 and y=6 so digit is 36
11 years agoHelpfull: Yes(0) No(0)

CAT Other Question

a certain type of mixture is prepared by
brand A at Rs 9 kg with brand B at Rs 4 kg.if the mixture worth is Rs 7 a kg.how many kgs of brand A are needed to make 40kgs of the mixture? the ratio of the ages ofA and B seven years ago was 3:4.the ratio of their ages nine years from now will be 7:8.what is B's age present ar present?