The greatest common factor of 18 and 36 is 18.
So, 18 goes into 18 once, and 18 goes into 36 twice.
1/2 is the fraction in simplest form.
it is impossible
Step-by-step explanation:
Based on the calculations, the unknown number is equal to 
- Let the unknown number be x.
<h3>How to find an
unknown number:</h3>
Translate the word problem into an algebraic expression, we have;
Adding 21 to the unknown number:

Multiplying the result by 3:

84 more than two-thirds of the unknown number:

Equating the equations, we have:

Cross-multiplying, we have:

Read more on word problems here: brainly.com/question/13170908
Answer:
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Step-by-step explanation: