Study the following information carefully and answer the questions that follows:

A company produces five different products, viz Television, Refrigerator, Mobile Phone, Oven and Water Heater. The total number of all the five products manufactured is 1200. 15 percent of the total number of products are Televisions. Three-tenths of the total number of products are Refrigerators. The number of Mobile Phones manufactured is 40 more than the number of Televisions. 22 percent of the total number of products is Oven and the remaining number of products is Water Heaters. If 25 percent of the number of Ovens are defective, what is the number of nondefective Ovens?

20 boys and 32 girls form a group for social work. During their membership drive an equal number of boys and girls also join the group. How many members does the group have now, if the ratio of boys to girls is 3:4?

Four examiners can examine a certain number of answer papers in 10 days by working for five hours a day. For how many hours in a day would two examiners have to work in order to examine twice the number of answer papers in 20 days?

If the numerator of a fraction is increased by 150% and the denominator of the fraction is increased by 300%, the resultant fraction becomes $5\over 18$ . What is the original fraction?