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Instructions
Study the following graph and answer questions that follow. The x-axis denotes the years from 1983 to 1991
Question 73
If in 1988, the sum of the food and fertilizer production was 170 million tonnes, the value of food production must have been (approximately, in million tonnes) .
Solution
From the graph, in the year 1988, the ratio of food production to fertilizer production is 5:3.5 i.e 10:7
Let the food production be 10X and the fertilizer production be 7X
Hence, the total is 10X+7X = 17X which equals 170
So, X = 10 and the total food production equals 10*10 = 100
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