exam Maths Puzzle Numerical Ability

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.

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Jim's doctor has prescribed medication that he must take every 5 hours. He started the medication at 10:00AM on Thursday. What is the first day on which she will take her medicat what is the answer to using addition on #1 and #2 and on #3 using substituion
#1)x + 2y =5 #2)5x -4y =1 #3) 7x + y = 1
3x +4y =1 -10x + 8y = -3 3x + 2y= -9