Simple...
you have:

and

Now, the first one is easy just divide it...

Now....

needs to be converted...
Multiply the whole number*denominator...
4*8=32
Now add the numerator....
32+3=35
Now use the original denominator...

Now divide...

Thus, your answer.
Answer:
12.4 in
Step-by-step explanation:
I whish i can help :)
11/20 is already reduced you cannot simplify this fraction
The mass of each book in grams if each box weighs 20 kilograms is 2000 grams
- Mass of each box = 20 kilograms
- Total books in the box = 10 books
<h3>Converting kilograms to grams</h3>
1 kilograms = 1000 grams
20 kilograms = 20,000 grams
Mass of each book in grams = 20,000 grams / 10
= 2000 grams
Learn more about kilograms to grams:
brainly.com/question/9301317
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90 = (20)(x)
so you have to solve for x
90/.20 =450
answer is 450