book Maths Puzzle Numerical Ability

2x-3y+5z=-5, 2y-3z=4, and 4z=-8

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book Other Question

Kathy can paddle her kayak 6 miles per hour in still water. It takes her as long to paddle 3 miles upstream as 4 miles downstream in the Wabash River. Determine the rivers current. how do you do these types of equations?:

5-2(y+1)=21