exam Maths Puzzle Numerical Ability

Find coordinates for point Z so that triangle OWX~OYZ

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exam Other Question

2/5m=3
4/5=m=6

what was done to the first equation to get the second one?

2x=10
2x+4=14

what was done to the first equation to get the second one?
12.Use the distributive property to write an equivalent variable expression.

2(z + 8)