exam Maths Puzzle Numerical Ability

2x-5y+z=5
3x+3y-z=17
4x-3y+2z=17

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exam Other Question

A rectangular swimming pool is twice as long as it is wide. A small walkway surrounds the pool. The walkway is a constant 2 feet wide and has an area of 196 square feet. Find the dimensions of the pool.: i cant figure this one out
how many liters of water must be evaporated from 10L of 40% salt solution to produce a 50% solution

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