How do alloys brass and bronze differ in composition ?

How do alloys like brass and bronze differ in composition ?

Brass and bronze are

(a) How does the painting of an iron object prevent its rusting? (b) How does the electrical conductivity of copper alloys, brass ad bronze, differ from that of pure copperr? (c) What is meant by 22 carat gold? Name the metals which are usually alloyed with gold to make it harder.

Bronze is an alloy of

Bronze is an alloy of

Alloy aluminium bronze is composed of