যদি x+3y = 40 এবং y = 3x তবে y = ?

A 12

B 18

C 22

D 6/5

Correct Answer: Option A

দেওয়া আছে, y = 3x
এখন, x+ 3y = 40
⇒x+3.3x =40
⇒x+9x = 40
⇒10x = 40
⇒x = 40/10 = 4
∴ y = 3.4 = 12