Number ratio division

Divide the number 20 into two parts so that the first part is four times larger than the second. What is the ratio?

Final Answer:

a =  16
b =  4
r =  4:1

Step-by-step explanation:

a+b=20 a=4b  a=4⋅ b  a+b=20 a−4b=0  Row2−Row1→Row2 −5b=−20  b=−5−20​=4 a=20−b=20−4=16  a=16 b=4
r=a/b=16/4=4=4:1

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