These type of exam questions, whether you consider them easy or hard, are senseless to adult working life. Who wants to know the ratio. In the real adult world, the one who gets to eat the most, wins, regardless of the ratio. Bickle over the ratio is a waste of time, which could be better used in other things, like surfing internet forums.
bro, what you need is just plain common sense to solve it. i still rem last time already got such questions for math in primary school. they called problem sum. i think its in the last section got 30pt and got 6 questions. that means each question got 5 pt. all 6 questions in last section all this kind of question during my primary school days.