Instruction: Analyze each problem and write a proportion to solve it.

Rubrics:

1 point - correct proportion
1 point - correct missing number

1 - 2) If 10 pencils cost ₱60, then how much would 6 pencils cost?

3 - 4) Mrs. Santos, the school librarian, catalogued 171 books in 5 days. At this rate, how many books could she catalogue in 10 days?

5 - 6) The ratio of boys to girls in a certain school is 5:6. If there are 420 girls, how many boys are there?