I was looking for the more logical answer for this without picking up pen and paper and I thought of it myself.rakeshd347 wrote:The three digits of a number add to 11. The number is completely divisible by 5. The first digit is double of the second digit. What is the product of the three digits?
a) 27
b) 36
c) 39
d) 40
e) 63
Even the solution i gave, i solved without pen and paperrakeshd347 wrote:I was looking for the more logical answer for this without picking up pen and paper and I thought of it myself.rakeshd347 wrote:The three digits of a number add to 11. The number is completely divisible by 5. The first digit is double of the second digit. What is the product of the three digits?
a) 27
b) 36
c) 39
d) 40
e) 63
Now the unit digit has to be either 5 or 0 as it is divisible by 5. If it were 0, then the product of the three digits will be 0 right. But no answer choice gives 0 as the option so obviously it has to be 5. Now the product has to be divisible by 5 as well and the only choice divisible by 5 is D.
Without pen and paper
... theCodeToGMAT wrote:Even the solution i gave, i solved without pen and paperrakeshd347 wrote:I was looking for the more logical answer for this without picking up pen and paper and I thought of it myself.rakeshd347 wrote:The three digits of a number add to 11. The number is completely divisible by 5. The first digit is double of the second digit. What is the product of the three digits?
a) 27
b) 36
c) 39
d) 40
e) 63
Now the unit digit has to be either 5 or 0 as it is divisible by 5. If it were 0, then the product of the three digits will be 0 right. But no answer choice gives 0 as the option so obviously it has to be 5. Now the product has to be divisible by 5 as well and the only choice divisible by 5 is D.
No don't take me wrong. Yours and Rich's solution is great and it can be done in less than a minute actually but now a days I am getting my brain used to of thinking logically and answer questions.
Honestly in the first attempt I solved the same way as you solved it
Thanks
Without pen and paper
But, i took & followed Ron's advise, which he gave yesterday; We are not the only one who is reading this forum.. and we should post "sound" solutions
Let the number be abcrakeshd347 wrote:The three digits of a number add to 11. The number is completely divisible by 5. The first digit is double of the second digit. What is the product of the three digits?
a) 27
b) 36
c) 39
d) 40
e) 63
