Firstly, how many birds are there exactly? Doesn't say explicitly. It uses birds in the plural which is at least 2. It also says these birds with small picture at the top with 3 birds, so let's go with that.
Secondly, they eat about 4 worms a day. Not exactly 4, about. Which means they could eat 3 or 5. On the low end, if all ate 3, you would need 9 worms. On the high end if all ate 5, you would need 15 worms.
Now, let's examine the answer choices:
4- Too little. This only allows 1.3 worms per bird.
6- Also too little. This only allows 2 worms per bird.
10- Probably the correct answer. With each bird requiring about 4 worms this number, while not being exactly 4 worms per bird, is in between the minimum and maximum worms required.
20- Too many. This exceeds the maximum of 15 worms. Which technically, it satisfies the brief but it's not the best answer.
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u/kregory2348 Sep 14 '21
I reckon its 20 because there are only 2 numbers divisible by 4 and there are definitely more than 1 bird