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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.

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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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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User Dragan
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7.3k points

1 Answer

5 votes

(4x)/(7x+4)=(1)/(2)\\ 7x+4=8x\\ x=4\\\\ 4x=4\cdot4=16
16 red marbles

answered
User David Shean
by
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