Let their investments be Rs. x for 12 months, Rs. y for 8 months and Rs. z for 6 months respectively.

Then, 12x : 8y : 6z = 4 : 6 : 8

Now, 12x/8y = 4/6   <=>   9x=4y   <=>   y=9x/4

And, 12x/6z = 4/8   <=>   4x=z     <=>    z=4x

Therefore, x : y: z  =  x : 9x/4: 4x  =  4 : 9 : 16

Describe your ideal job?

You should use this question to relate to the post you applied and give them the feel that this is close to your ideal job. So align your wonderful ideal job reasons to the responsibilities of the job posting. 

This is a question that you can use to add some humor or do a icebreaker like just joking that your ideal job is to work in a space station or would like to work in Hollywood but after a quick laugh give a realistic answer like my ideal job is where i get more responsibilities, enhance my skills and grow, and of-course you can add saying you would like to be part of a team where work is fun. If you want to go further, You might add at the end you heard good things about the work environment in the interviewing company.

Why Are You Looking For A New Job?

Purpose - This question is asked to get some insights into your personality and your relationship with your last job, colleagues and employer. So you should be careful while answering this question.

1. Never bad-mouth your former employers.
Why? It is very simple as the interviewer will envision that you will bad-mouth them when you decide to leave, and nobody wants bad rumors about themselves or their company.

2. Never bad-mouth your previous co-workers.
Why? This world is too small, your co-workers could be a friend, relative of the interviewer.

3. Never bad-mouth about the responsibilities and tasks you performed at your previous job.
Why? Thinking that the new employer would give you great responsibilities and tasks and if you give a hate speech on the previous job responsibilities and activities and to your surprise if your interviewer is thinking about similar tasks for this position, you have already given a reason to quit the new job which you have not yet got. So guess, the chances of you getting the job is Nil.

Keep the answer short and try not to disclose too much. A straight answer is best and as stated above avoid negative statements about yourself, your work, or your ability to get along with others.

E.g.
My organization was forced to downsize.

Our department was eliminated due to corporate restructuring.

I am looking for a bigger challenge and to grow my career.

I am relocating to this area due to family ( Marriage, Kids Education etc...)

I received degree and want to utilize my new skills in this new position.

I am interested in a job with more responsibility and challenges.

I am seeking a position with a stable company with room for growth and opportunity for advancement.