Daniel is three years older than twice his brother's age. Daniel is 17. Fill in the box with the expression that represents the age of Daniel's brother. Let b represent Daniel's brother's age.

Answer :

Daniel's age is X
Daniel's brother age is Y

X = 3 + ( 2Y )

Y = ( X - 3 ) / 2

In case of Daniel is 17

then his brother's age is = ( 17 - 3 ) / 2 = 7 years