Subject: General Aptitude · Chapter: Ratio and Proportion · Exam: · Marks: · Difficulty:
In an alloy, the ratio of copper and zinc is 5 : 2. If 1.250 kg of zinc is mixed in 17 kg 500 g of alloy, then the ratio of copper and zinc in the alloy will be
(a)1 : 2
(b)2 : 1
(c)2 : 3
(d)3 : 2
Answer
Answer (as printed): B
Explanation
Quantity of copper in 17.5 kg of alloy $$=\left(17.5 \times \frac{5}{7}\right) \mathrm{kg}=12.5 \mathrm{kg} .$$ Quantity of zinc in 17.5 kg of alloy $$=\left(17.5 \times \frac{2}{7}\right) \mathrm{kg}=5 \mathrm{kg} .$$ ∴ Required ratio $=12.5:(5+1.25)=12.5: 6.25=2: 1$.