the average age of a , b and c is 29 years . if the average age of a and c is 32 years , what is the age of b in years ?
"age of b = age of ( a + b + c ) â € “ age of ( a + c ) = 29 ã — 3 â € “ 32 ã — 2 = 87 â € “ 64 = 23 years e"
subtract(multiply(29, const_3), multiply(32, const_2))