Jonathan has a collection of 400 marbles. blue marbles make up17%, percent of his collection. how many blue marbles does jonathan have?

17% of 400 is 68.
Another way u can do it is 17% of 100 four times since its easier to do. 
17% of 100 is 17.
we have to do this 4 times since 100 goes into 400 four times.
So 17*4 =68

Since percent is dividing by 100, you divide 400 by 100, and you get 4. Then, you multiply 4 by 17, since blue marbles make up 17% of 400 marbles. Then finally, you get 68 blue marbles.

Your maths is very weak try yourself this would improve your skills don't depend on others

The last answer choice