Study Assistant · Algebra tutor
You
A stamp collection has 3 times as many foreign stamps as domestic ones. If there are 48 stamps in total, how many are foreign?
AI
Let d be the number of domestic stamps. Then the foreign stamps number 3d.

Since the whole collection is 48:
d + 3d = 48 → 4d = 48 → d = 12.

So there are 3 × 12 = 36 foreign stamps (and 12 domestic).
You
If I add 12 more foreign stamps to the collection, what's the new ratio of foreign to domestic?
AI
New foreign total: 36 + 12 = 48, with domestic unchanged at 12.

Ratio foreign : domestic = 48 : 12. Divide both by 12 → 4 : 1.

So the collection is now 4 foreign stamps for every 1 domestic stamp.
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