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1. If 10 pieces of apples cost Php125, ____ apples can be bought with Php45.

2. 5 kilograms of sugar cost Php142.50. 15 kilograms of sugar cost ____.

3. 10 pencils cost Php62. The cost of 1 dozen of such pencils is ____.

4. The first 3 terms of a proportion are 8,24, and 25. Find the fourth term.

5. Find the first term of a proportion whose 2nd,3rd, and 4th terms are 18, 40, and 60 respectively.