exam Maths Puzzle Numerical Ability

PLEASE HELP ME WITH THIS!!
IF THE LENGTH OF THE SIDE OF A SQUARE IS INCREASED BY 6 UNITS, THE AREA IS MULTIPLIED BY 4. FIND THE ORIGINAL LENGTH.

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exam Other Question

If the probability that at least one person makes an A on the final exam is 0.15, what is the probability no one makes an A? using the distance formula
how would u find a in the following problem
(-4,1)(a,8);d=square root of 50