The age of Grace is 9 years old
<h3><u>Solution:</u></h3>
Given that sum of Ava’s and Grace’s age is 35
Ava is one year less than three times Grace’s age
<em><u>To find: Age of Grace</u></em>
Let "a" be the age of Ava
Let "g" be the age of Grace
According to given information,
<em><u>sum of Ava’s and Grace’s age = 35</u></em>
Ava age + Grace age = 35
a + g = 35 -------- eqn 1
<em><u>Also given that Ava is one year less than three times Grace’s age</u></em>
Age of Ava = three times Grace’s age - 1
a = 3g - 1 ---------- eqn 2
<em><u>Let us solve eqn 1 and eqn 2 to find values of "a" and "g"</u></em>
Substitute eqn 2 in eqn 1
3g - 1 + g = 35
4g - 1 = 35
4g = 36
<h3>g = 9</h3>
Thus the age of Grace is 9 years old