exam Maths Puzzle Numerical Ability

Write the scale without units.

1 mm : 92 cm

Any help with equation would be Greatly</b> apreciated.No answers from Solver 311911,please:)

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How many ounces of pure water should be added to 20 ounces of a 43% acid solution in order to obtain a 35% solution? 21000=12000(1+r/4)^36 solve for 4