book Maths Puzzle Numerical Ability

Use Cramers Rule to solve

2x-3y+z=5
x+y+z=0
4x+2y+4z=4

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book Other Question

20. Solve the following system of linear inequalities by graphing.

3x + 4y < 12 and x + 3y < 6 and x > 0 and y A man rows 25 km upstream and 50 km downstream in 12 hrs. The next day he rows 30 km upstream and 65 km downstream in 15 hrs. Then the rate of current is