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Step-by-step explanation:
4:3
4+3=7
4x + 3x= 7x
7x is the total sq.cm which is 300
7x= 300
x= 300/7
= 42.8
length= 4x
= 4 × 42.8
= 171.42
breadth= 3x
= 3 × 42.8
= 128.4