Walter and brian each have a cd collection.
• the number of cds in walter’s collection can be represented by x.
• the number of cds in brian’s collection is 3 times the number in walter’s collection.
• the total number of cds in both collections is 144.
what is x, the number of cds in walter’s collection?
f 108
g 48
h 72
j 36

Option "J" 36

Step-by-step explanation:

Given: The number of CDs in Walter’s collection can be represented by x.

The number of CDs in Brian’s collection is 3 times the number in Walter’s collection. The total number of CDs in both collections is 144.

To find: The value of x, the number of CDs in Walter’s collection.

Solution: The total number of CDs in both collections is 144.

The number of CDs in Walter’s collection is x.  

The number of CDs in Brian’s collection is 3x.

As per question,

Hence, there are 36 CDs in Walter’s collection.

So, option "J" 36 is correct.