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Water hardness is typically measured in parts per million (ppm) of calcium carbonate, reflecting the concentration of calcium and magnesium ions.
95 110 128 ? 181 222
...18, 25, 33, 42, 52, 63, ?
2187, 1458, 972, ?, 432, 288
Choose the correct alternative
21: 3 ∷ 574: ?
8 9 22 75 316 ?
...17 32 99 ? 1965 11784
...If 18 x 10 42 -22,
Then, 50% of 2x - 25% of x = ?
...There are three series given below which are following with the same pattern.
Series I: 1, 12, 38, 193, 1355
Series II: 6, B, C, D, E
...9, 21, 67, 273, 1371, ?
14 15 34 116 460 2325
...