A is 3 years younger than C but one year older than   D . D is one year older than B but 4 years younger than C .   C is 15 years old. What is the age of B ?

Step-by-step solution

According to the question, A = C − 3   . . . . . . . . . .   ( i ) A = D + 1     . . . . . . . . . . ( i i ) D = B + 1     . . . . . . . . . . ( i i i ) D = C − 4     . . . . . . . . . .   ( i v ) C = 15   . . . . . . . . . . . . . . . . ( v ) Substituting the value of C in equation ( i v ) , we get, D =   11 Substituting the value of D in equation ( i i i ) , we get, B   =   10 ∴ B's age is 10 years.