book Maths Puzzle Numerical Ability

-2x-5=x+4

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X and Y have some chocolates with each of them.if X GIVE y FOUR CHOCOLATES, Y will have twice the number of chocolates as X.instead if Y gives X two chocolates,both of them will have equal numbers of chocolates with them.how many chocolates did X and Y have initially ?

and :- (16,20) Can someone please help me with this problem. Thanks
A rectangular piece of tin measures 36 inches by 25 inches. A square measuring 4 inches is cut out of each corner and the sides are folded to form a box. What is the volume of the box?