One number x is thrice the other number y. If the sum of both the numbers is 20, then what is the values of x and y are respectively ?
Explanation:
Given, x = 3y ...(1)
Also, x + y = 20 ...(2)
Substituting y = 3x from (1) in (2)
⇒ 3y + x = 20 ⇒ 4y = 20 ⇒ y = 5
∴ x = 3y = 15
Hence, option (c).