1. In what ratio, tea at Rs.90 per kg should be mixed with another tea at Rs.120 per kg to get a tea of  Rs. 100 per kg

(a) 2 : 1
(b) 3 : 1
(c) 3 : 2
(d) 4 : 3

2. Two varieties of rice at Rs. 10 per kg and Rs. 12 per kg are mixed together in the ratio 1 : 2. Find the average price of the resulting mixture

(a) Rs. 11 per kg
(b) Rs. 11.22 per kg
(c) Rs. 11.33 per kg
(d) Rs. 11.44 per kg

3. On combining two groups of students having 30 and 40 marks respectively in an exam, the resultant group has an average score of 34. Find the ratio of the number of students in the first group to the number of students in the second group

(a) 2 : 1
(b) 3 : 2
(c) 3 : 1
(d) 4 : 3

4. On mixing two classes of students having average marks 25 and 40 respectively, the overall average obtained is 30 marks. Find the number of students in first class if the second class has 30 students

(a) 45
(b) 60
(c) 70
(d) 80

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