helen is 9 years old and her brother is two times as old as she. when helen bocomes 18 what will her brother age be?
2 * 9 = 18
Helen's brother is now 18. He's 9 years older than Helen.
18 + 9 = ?
27
To solve this problem, we need to determine the current age of Helen's brother and then calculate how old he will be when Helen turns 18.
Given that Helen is currently 9 years old, we can find the age of her brother by multiplying her age by 2, as her brother is two times as old as she is. Therefore, the age of Helen's brother is 9 * 2 = 18 years old.
Now, we need to calculate how old Helen's brother will be when she turns 18. We simply need to add the age difference between their current ages to the brother's current age.
Helen will turn 18 in 18 - 9 = 9 years.
So, when Helen becomes 18, her brother will be 18 + 9 = <<18+9=27>>27 years old.