exam Maths Puzzle Numerical Ability

At the opening of the stock exchange Mel sold part of his 30 shares of the Heartbreak Gold Mine for a total of $165. Later in the day the price of a share doubled, and he sold the

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I think I did this right, but I am not totally sure. Could you please tell me if I did?

Solve for m

S=under the radical 8mn

squared(S=under the radical 8mn)squared
S squared= under the radical 8m(n)squared

Please help me. using each of these numbers once ( 15,4,10,19,22 ) with any combination of the operations of multiplication, addition, substraction, or division to make a true equation equaling 1.