Question

The ratios of copper to zinc in alloys a and b are 3 : 4 and 5 : 9, respectively. A and b are taken in the ratio 2 : 3 and melted to form a new alloy
c. What is the ratio of copper to zinc in c

Answer 1

Ratio of Copper to Zinc  = 27 : 43  if Cu & Zn in 3 :4 & 5 :9 ratio are mixed in 2 : 3 Ratio

Step-by-step explanation:

Material  A

Copper  = 3/7

Zinc = 4/7

Material B

Copper = 5/14

Zinc = 9/14

A & B taken in 2 : 3 Ratio

=> A = 2X

& B  = 3X

Copper =  (3/7)2X  + (5/14)3X  =  27X/14

ZINC  =  (4/7)2X  + (9/14)3X  =  43X/14

Ratio of Copper to Zinc = 27X/14 : 43X/14

= 27 : 43

Ratio of Copper to Zinc  = 27 : 43

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