A circle with a circumference 20 has an arc with a 72 degree central angle
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The age of Tonya is 14
The age of Kevin is 7
The age of uncle Rob is 60
Explanation:
Let T denote Tonya
Let K denote Kevin
Let R denote Uncle Rob
Tonya is twice Kevin's age, the expression can be written as
-------(1)
Kevin’s age in three years Tonya will be 17, the expression can be written as
--------(2)
In another three years uncle uncle rob will be 3 times Tonya's age, the expression can be written as
---------(3)
From (2),
Thus, the age of Tonya is 14 years.
Substituting in
, we get,
Thus, The age of Kevin is 7 years.
Substituting in
, we get,
Thus, The age of uncle Rob is 60