13(1/5)-[1/5 of {4(1/25)+of 5(1/4) -6(1/4)}]
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1:10 1:20 1:25 1:50 1:100 1:150 1:200 1:250 1:500 1:1000. CHEMICAL 1 litre 400ml 200ml 100ml 80ml 40ml 20ml 13ml 10ml 8ml ...
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