Lin is 7 years younger than Adrian,

Adrian is 4 years older than half of Maya's age,

The sum of the 3 ages is 61,

How old is Lin?

For this item, we let x be Maya's age. By the representation, Adrian age will be,

0.5x + 4

And that Lin's age will become,

0.5x + 4 - 7

Summing up all the ages,

x + (0.5x + 4) + (0.5x - 3) = 61

The value of x from the equation is 30. Therefore, Lin's age is,

0.5 (30) - 3 = 12

Maya is 30 years old, Adrian is 19 years old, Lin is 12 years old. 30 + 19 + 12 = 61.

Start by guessing a number, Then add or subtract what the question says, you will soon have the answer.