Directions : Read the data carefully and answer the following questions:
Below table shows the number of books (in hundreds) of two subjects (Physics and Chemistry) printed by a shopkeeper in five years (2019, 2020, 2021, 2022, and 2023):
Physics
Chemistry
2019
66
42
2020
78
75
2021
54
36
2022
102
60
2023
60
51
Note:- The ratio of number of Chemistry books printed to the number of Biology books printed in each year is 2: 3.
What is the average number of books of Biology subject printed in 2019, and 2021, together?
1.5810
2.5850
3.5800
4.5820
5.5750
Correct Answer : 2
Solution :
The number of Physics books printed by the shopkeeper in 2019 = 6600
The number of Chemistry books printed by the shopkeeper in 2019 = 4200
The number of Biology books printed by the shopkeeper in 2019 = 4200 * 3/2 = 6300
Similarly, calculating the remaining data:
Physics
Chemistry
Biology
2019
6600
4200
6300
2020
7800
7500
11250
2021
5400
3600
5400
2022
10200
6000
9000
2023
6000
5100
7650
Required average = (6300 + 5400)/2 = 5850
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