Answer:
285 (or 30% of 950)
Step-by-step explanation:
It might help if you think of it in terms of 10% and 1%. 10% is the same as dividing by 10. so 10% of 45 is 45. 1% is dividing by 100, so 10% of 55 is .55
Now, it also asks what is the amount that don't fir into the 30% and 40% of the books we know. Well, that means we want to know the remaining 30%. It's 30% history, 40% science and 30% other to make 100%.
So what is 30% of 950? You could just multiply 950 by 30% or .3, or you could do the method I mentioned. What is 10%? 95. Then you multiply that by 3 to get 30%. so 30% of 950 is 285
