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Rhiauna
She has a total of 45 CDS. 

One Shelf Have 15 Cds 
 Multiply 15 x 3 and you have 45 CDs total

Total number of CDs is 45 CDs

Given that;

Number of stacks Tina have = 3

Number of CDs in each stacks = 5

Number of shelves = 3

Find:

Total number of CDs

Computation:

Total number of CDs = Number of stacks Tina have × Number of CDs in each stacks × Number of shelves

Total number of CDs = 3 × 5 × 3

Total number of CDs = 45 CDs

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