## 36. 5 out of 2250 parts of earth is sulphur. What is the percentage of sulphur in earth ?

## 37. In a class of 65 students and 4 teachers, each student got sweet that are 20% of the total number of students and each teacher got sweets that are 40% of the total number of students. How many sweets are there ?

## 38. If 35% of a number is 175, then what percent of 175 is that number ?

## 39. A number reduced by 25% becomes 225. What percent should it be increase so that it becomes 390 ?

## 40. In an examination it is required to get 296 of the total maximum aggregate marks to pass. A student gets 259 marks and is decided failed. The difference of marks obtained by the student and that required to pass is 5%. What are the maximum aggregate marks a students can get ?

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