If N is divided into two part in the ratio a:b, then First part =N×a∕(a+b) Second part =N×b∕(a+b) Calculation: Let the quantity of three varieties of wheat be 3x,4x and 2 x and cost of third variety of wheat be Rs. a/kg According to the question, ⇒(3x×30)+(4x×35)+(2x×a)=34×(3x+4x+2x) ⇒90x+140x+2xa=306x ⇒2xa=76x ⇒a=38 ∴ The cost of the third variety of wheat is Rs. 38∕kg