Of all the items at the exhibition, 30% are porcelain items, and 60% of the remainder are ceramic items.

Of all the items at the exhibition, 30% are porcelain items, and 60% of the remainder are ceramic items. The rest is glass products. Moreover, the number of glass products is 35 less than the number of ceramic products. • What is the percentage of glass products at the exhibition? • How many items are there in total?

1. Determine the percentage at the exhibition of ceramic and glass products together:

100 – 30 = 70%;

2. Determine the percentage at the exhibition of ceramic products. We take this percentage for a and makes the proportion:

70% – 100%, and% – 60%;

70: a = 100: 60;

a = (70 x 60): 100;

a = 42%;

3. Determine how many percent of glass items were at the exhibition:

70 – 42 = 28%;

4. Determine how many percent more ceramics at the exhibition than glass:

42 – 28 = 14%;

5. Determine the total number of products. We take it for a and make up the proportion:

35th edition – 14%, and edition – 100%;

35: a = 14: 100;

a = (35 x 100): 14;

a = 250 ed.

Answer: 250 items were at the exhibition, of which 28% were glass items.