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Sulphur deficiency leads to the yellowing of tea leaves, as it is an essential nutrient for plant metabolism and growth.
One-fifth of a number is equal to two-fifths of 25% of another number. Determine the ratio of the two numbers.
12, 26, 54, 96, 150, 222, 306
A boat can travel upstream at 12 km/h and downstream at 18 km/h. What is the speed of the boat in still water?