An alloy consists of 
kg of copper and 
kg of tin. Find the ratio by weight of tin to the alloy
Solution:
Find the compounded ratio of:
(i) 2 : 3 and 4: 9
(ii) 4: 5, 5: 7 and 9: 11
(iii) (a – b) : (a + b), (a + b)2 : (a2 + b2) and (a4 – b4) : (a2 – b2)2
Solution:
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