exam Maths Puzzle Numerical Ability

What is the formula for converting fractions into decimals ?(i forgot because i was using a shortcut instead of the real formula)

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exam Other Question

Fully factorise the following expression. (9m^2 - a^2)

Can you help me with this one please? Candy costing $4.30/lb is mixed with candy costing $7.80/lb. in order to create a mixture costing $6.30/lb. If the mix weighed 21 lbs. How many pounds of each must have been combined?