Usually the easiest way to solve this is by using a calculator. Of course only if your teacher allows you too.
You need to do 20 divide by 21 to get a decimal. Then if you multiply the decimal by hundred you should get the percentage.
multiply 14 x 2.54
14 x 2.54 = 35.56 centimeters
You can use a diffrent kind of ruler for math then you could find the answer.
Answer:
141 5/7
Step-by-step explanation:
8c + 10b ÷ 7a
Let c = 7, b = 12, and a = 5
8*7 + 10*12 ÷ 7*5
Multiply and divide from left to right
56+120 ÷7*5
56+ 600/7
Get a common denominator
392/7 + 600/7
992/7
Change from an improper fraction to a mixed number
141 5/7
