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WBCS Main Examination 2023 — Paper VI: Arithmetic and Test of Reasoning · Question 196 of 200

Q196
ArithmeticRatio, Proportion & Mixtures
Zinc and copper are in the ratio 5 : 3 in 200gm of an alloy. How much grams of copper be added to make the ratio as 3 : 5?
  1. a.72
  2. b.$\frac{1}{200}$
  3. c.$133\frac{1}{3}$
  4. d.66

Answer: (C) $133\frac{1}{3}$

The alloy has 125 g zinc and 75 g copper. For zinc : copper = 3 : 5 the copper must be 125 × $\frac{5}{3}$ = $208\frac{1}{3}$ g, so $133\frac{1}{3}$ g must be added. Only copper changes, so the zinc stays at 125 g.

Q195 Whole paperQ197
Zinc and copper are in the ratio 5 : 3 in 200gm of an alloy. How mu… — WBCS Main Examination 2023 Q196 | Prostuti360°