#### 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} : (a^{2} + b^{2}) and (a^{4} – b^{4}) : (a^{2} – b^{2})^{2}

**Solution:**

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