exam Maths Puzzle Numerical Ability

i HAVE N0 iDEA H0W D0 D0 THE DiSTRiBUTiVE PR0PERTY ..

D0ES ANYB0DY KN0W AN EASiER WAY ?

0NE EXAMPLE PR0BLEM iS

-(4-T)

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three faces of a box have a common vertex and their combined area is 20cm squared. What is the total surface area of the box?

thank you. Find least no in which when divide by 5,7,9 then it leaves remainder 1,2,3 respectively. What is logic for solving this problem.