Question
A mixture of ink and water is in the ratio 6:4. If 15%
of the mixture is removed and replaced with water, what will be the new ratio of ink to water?Solution
Total quantity = 10x litres Ink = 10x × (6/10) = 6x litres Ink left = 6x × 0.85 = 5.1x litres Water = 10x - 5.1x = 4.9x litres Required ratio = 5.1x : 4.9x = 51 : 49
Find the value of 'a' in the given data if the mean of the given data is 18.
12, 15, 20, 17, 19, 14, 21, a, 13, 16
Find the sum of 1² + 3² + 5² + 7²……………………………….23².
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‘N’ is the largest three-digit number that leaves 6 as a remainder when divided by 7, 8 and 5. Find the sum of digits of ‘N’.
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