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21.if a successively divided by 5,3,2 respectively give the remainder 1,2,0.what is the no when is divided by 2 3, 5?

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In a mixture of petrol and kerosene, petrol is only 99 litres.If this same quantity of petrol is presented in another mixute of petrol and kerosene where total volume would be 198 litres less than the actual mixture,then the concentration of petrol in the actual mixture would have been 13.33% point less than that of the new mixture.What is the concentration of petrol in actual mixture? ab+a+b=250
bc+b+c=300
ca+a+c=216
find a+b+c?