SOLUTION: Sally collects stamps. Of all her stamps 45% are from the United States. She has 90 stamps from the United States. How many total stamps does she have?

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Sally collects stamps. Of all her stamps 45% are from the United States. She has 90 stamps from the United States. How many total stamps does she have?      Log On


   

Question 1058231: Sally collects stamps. Of all her stamps 45% are from the United States. She has 90 stamps from the United States. How many total stamps does she have?
Found 3 solutions by Boreal, josmiceli, ikleyn:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
90 stamps are .45 of her collection
90/.45=x/1.00
cross-multiply
.45x=90
x=200 stamps, dividing both sides by 0.45

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = the total of the stamps she has
+.45x+=+90+
+x+=+90%2F.45+
+x+=+200+
She has 200 stamps

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.

90%2Fx = 0.45, according to the condition.

Then x = 90%2F0.45 = 200.
Answer. There are 200 stamps in the collection.

There is a bunch of lessons on percentage problems
    - Percentage problems
    - Percentage word problems (Type 1 problems, Finding the Part)
    - Percentage word problems (Type 2 problems, Finding the Rate)
    - Percentage word problems (Type 3 problems, Finding the Base)
    - More complicated percentage problems
    - Problems on percentage that lead to unexpected results
in this site.