The ratio of country albums to jazz albums in a music collection is 2: 3. if the music collection has 45 albums, how many country albums are there?

{country albums}:{jazz albums}=2:3
3{country albums} = 2{jazz albums}

{country albums} + {jazz albums} = 45
{jazz albums} = 45 - {country albums}

3{country albums} = 2(45 - {country albums})
3{country albums} = 90 - 2{country albums}
5{country albums} = 90
{country albums} = 18

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