Mary mixies white paint and blue paint in the ratios 2: 3. she makes a total of 20 litres of paint. how much more blue paint does she needs to add to the mixture so the ratios of white paint to the blue paint become 1: 7?

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

570, the answer is 570, hope it