A bag contains only black and blue coloured stones. If the number of stones in the given is in the ratio 3:7,then find the percentage of black coloured stones in the bag.
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no of stones in the ratio= 3:7
black coloured stones =3
-----‐---------------------------- -----
blue coloured stones 7
total coloured stones =3+7=10
% of black coloured stones =3 x100
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10
=30%
% of blue coloured stones = 7 x100
---
10
=70%
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