. One number is 3 times another number


If 15 is added to both the numbers, then one of the new numbers becomes twice that of the other new number. The numbers are

A: 15, 45

B: 12, 36

C: 13, 39

D: 14, 42

Best Answer

Explanation:

Let the first number be , then the second number is 3x.

Now,15 gets added to both the numbers.

The numbers will be x+15,3x+15.

Now, given that one number becomes twice of the other. So, the equation is

2(x+15)=3x+15

⇒2x+30=3x+15

⇒3x-2x=30-15

⇒x=15

and 3x=3×15=45 

So, Option (A) is correct.

Final Answer: 

The numbers are 15,45. So, option (A) is correct.

 

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