Answer:
100 bikes
Step-by-step explanation:
10% is the same as muiltiplying the number by 1/10 or dividing the number by 10. So if you say you have 10% of 640, it would be 64.
I think that the answer is -1/6. I got this by subtracting 3 on both sides according to the order of operations and got -1. Next, I divided 6 on both sides to undo the multiplication. Since you can't do 1 divided by 6, you can leave it as a fraction which is -1/6.
Julia needs 3

cups of oatmeal, and she can only get it in

cup quantities at a time. We know that

makes 1 whole, so we need to multiply the amount of whole cups she has by 4.
3 * 4 = 12
Finally, we see that there is

cup of extra oatmeal that Julia wants, so we add one more to our sum.
It will take 13 sets of

cups of oatmeal to make 3

cups of oatmeal.
Hope that helped =)