exam Maths Puzzle Numerical Ability

Please step me through dividing (3-i)/6i. thanks!

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exam Other Question

In 1991, the separation between college football goalpost uprights was reduced from 23 feet, 4 inches to 18 feet, 6 inches. To the nearest tenth of a percent what was the reduction? The question says round to the nearest tenth.

Round 25.13
Round 50.26
Round 113.04

Round all of those to the nearest tenth. Can some one show how to do that problem?