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21-12-2016
Mathematics

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The ratio of rock music to total CDs that Ella owns is 25/40. Paolo has 50 rock music CDs. The ratio of rock music to totals CDs in his collection is equivalent to the ratio of rock music to total CDs in Ella's collection. How many CDs do they own? A) 65 B) 80 C) 120 D) 130

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apologiabiology apologiabiology

21-12-2016

ok, this quetison is worded wierdly

simplification:
rock:total for ella=25:40

Pablo rock=50
rock:total for pablo=rock:total for ella

so basically we have

rock:total=25:40
and rock=50

easy
rock=25 units
50=rock
50=25 units
divide both sides by 25
2=1unit

total=40 units
40 times 2=80
they each hav a total of 80 cds

answer is B

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