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UPSC Prelims 2024CSATBasic NumeracyAlgebra - Linear Equations

Q50. The total cost of 4 oranges, 6 mangoes and 8 apples is equal to twice the total cost of 1 orange, 2 mangoes and 5 apples. Consider the following statements :
1. The total cost of 3 oranges, 5 mangoes and 9 apples is equal to the total cost of 4 oranges, 6 mangoes and 8 apples.
2. The total cost of one orange and one mango is equal to the cost of one apple.

Which of the statements given above is/are correct?

A. 1 only
B. 2 only
C. Both 1 and 2✓ Correct
D. Neither 1 nor 2

Detailed Solution

✓ Correct Answer: Option C

Let O, M, and A represent the costs of one orange, one mango, and one apple, respectively. From the given information: 4O + 6M + 8A = 2(1O + 2M + 5A) 4O + 6M + 8A = 2O + 4M + 10A Rearranging the terms to one side: (4O - 2O) + (6M - 4M) + (8A - 10A) = 0 2O + 2M - 2A = 0 Dividing by 2: O + M - A = 0 O + M = A This equation directly matches Statement 2.

So, Statement 2 is correct. Now, let's check Statement 1: Is 3O + 5M + 9A = 4O + 6M + 8A? Rearranging the terms: 9A - 8A = (4O - 3O) + (6M - 5M) A = O + M This equation is identical to the relationship we derived from the initial problem statement.

Therefore, Statement 1 is also correct. Since both Statement 1 and Statement 2 are correct, the answer is (C). This question tests algebraic manipulation and problem-solving skills.

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