exam Maths Puzzle Numerical Ability

Help me solve this equation: 0.31x+0.49(x+315)=215.15

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exam Other Question

time it takes to travel 180 miles upstream. the speed oof the current in the stream is 5.5 milies per hour. find the speed of the boat in still water. Determine the range.
17, 16, 10, 15, 20