alexandraemk240 alexandraemk240

01-07-2018
Mathematics

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A bag has red and white counters in the ratio 4:7. If I add 4 white counters the ratio becomes 1:2. Work out the number of red counters in the bag.

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konrad509 konrad509

01-07-2018

[tex]\dfrac{4x}{7x+4}=\dfrac{1}{2}\\ 7x+4=8x\\ x=4\\\\ 4x=4\cdot4=16[/tex]
16 red marbles

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