It's right there in the question, staring back at you. " /100 " means "percent". "20/100" means "20 percent".
I'm in middle school (8th grade) and this is relatively easy, for me, so...
if each batch of muffins can make 6 muffins, and she makes 2.5 batches of blueberry muffins which will make 15 muffins, she will need to make 7.5 batches of banana muffins to equal 45 muffins and 45 + 15 = 60 muffins.
Here is the math part of it......
1 batch = 6 muffins
She makes 2.5 batches, 2.5 * 6 = 15 muffins
x*6 = 45
divide 6 by both sides to get this
x = 7.5
She needs to make 7.5 batches in order to make the rest of the 60 muffins
See the attached picture. You'll find a tree with four branches at level 1 (each of the four sectors of the spinner). Each of these branches is divided in four sub-branches: the possible results of tossing two coins (HH, HT, TH, TT).
So, there are 16 possible outcomes (numbered below each leaf).
If you want to roll an odd number, you have to take branch 1 or 3 at first level.
Then, for each of those, you have to toss exactly one head, so you have to take HT or TH.
The good outcomes are thus 2, 3, 10 and 11, leading to a probability of 4/16=1/4=25%.
This problem can be done using the Pythagorean theorem(a^2 +b^2=c^2) or by using Trig (Sine, Cosine, Tangent) which do you prefer to be shown?