Question
A person purchased diesel at Rs. 6, Rs. 9 and Rs. 10 per
litre in three successive years. If he spent Rs. 4500 each year on diesel, then find the approximate average cost (per litre) paid by him in the given three successive years.Solution
According to the question, Quantity of diesel purchased by him in 1 year = (4500/6) = 750 litres Quantity of oil purchased in 2 year = (4500/9) = 500 litres Quantity of diesel purchased in 3 year = (4500/10) = 450 litres Total quantity of oil purchased in give three years = 750 + 500 + 450 = 1700 litres Total amount spent on diesel in given three years = 4500 × 3 = Rs. 13500 Required average = 13500/1700 = 7.9411 ~ Rs. 8
- What will come in place of (?), in the given number series.
1, 4, 9, 16, ?, 36 {(12√5 + 6√5 )} ×{(10√5 - 5√5 )} - 8² + 6² = ?
11          20          ?             64          112        192
...350 435 367 ? 384 401
...0, 6, 24, ?, 120, 210
21, 37, 73, 137, ?, 381
What will come in place of the question mark (?) in the following series?
4, 11, 32, 95, 284, 851, ?
18, 34, 70, 134, ?, 378
120, 136, 111, 147, ?, 162
What will come in place of the question mark (?) in the following number series?
124, 131, 117, ?, 110, 145
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