Question
A 60-litre mixture contains only water and oil in the
ratio 5:1, respectively. If 36 litres of the mixture is replaced with the same quantity of oil, then find the quantity of oil in the final mixture.Solution
Amount of oil in the mixture = 60 × (1/6) = 10 litres Amount of oil withdrawn = 36 × (1/6) = 6 litres Quantity of oil in the final mixture = 10 – 6 + 36 = 40 litres
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What will come in place of the question mark (?) in the following series?
77, 198, 342, 511, 707, ?
107    157    194    ?     237    247
...3    8    26    93    ?   1985   11940
...257, 399, 566, ?, 983, 1237Â
246, 102, 202, ?, 174, 158
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...155, 161, 173, 191, ?, 245
79Â Â Â Â Â 86Â Â Â Â Â Â 76 Â Â Â Â Â Â 89Â Â Â Â Â Â 73 Â Â Â Â Â Â ?
...- What will come in place of (?) in the given number series.
729, 243, 81, 27, ?, 3 135, 148, ?, 184, 207, 236
