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In a bag, there are red and blue cubes in the ratio 4:7.
Sam adds 10 more red cubes to the bag.
Now there are red and blue cubes in the ratio 6:7.
How many blue cubes are in the bag?

Sagot :

konrad509
x - red
y - blue

[tex]\frac{x}{y}=\frac{4}{7}\\ \frac{x+10}{y}=\frac{6}{7}\\\\ 7x=4y\\ 7x+70=6y\\ 4y+70=6y\\ 2y=70\\ y=35\\\\ 7x=4\cdot35\\ 7x=140\\ x=20[/tex]
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