Question

Two types of steel are available. Type A contains 5% of nickel and type B contains 40% of nickel. How much of each type be mixed to obtain 140 tonnes of steel containing 30% of nickel?

• A. 40,100 tonnes
• B. 50,125 tonnes
• C. 30,750 tonnes
• D. 60,180 tonnes
• E. None of these

Answer 1

The correct option is A 40,100 tonnes

Nickel in Type A = 5%
Nickel in Type B = 40%
Nickel in resulting steel = 30%.
By Alligation rule
Type A:Type B = 10:25 = 2:5
We have to obtain 140 tonnes of steel

$\therefore$ Steel of type $A=\frac{2}{7}\times 140=40$ tonnes