exam Maths Puzzle Numerical Ability

2x to the third - 10x to the 2nd + 3x - 15

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exam Other Question

Order the ratios from least to greatest

5:16, 3/8 , 2 to 6, 4/15, 12:40

Any help with this equation would be Greatly</b> appreciated. A boat moves 9 kilometers upstream in the same amount of time it moves 19 kilometers downstream. If the rate of the current is 9 kilometers per hour, find the rate of the boat in still water.