exam Maths Puzzle Numerical Ability

I forgot the formula to solve problems like this: 10 over 25 = x over 10

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exam Other Question

write the system of linear equations represented by the augmented matrix. Use x,y,z and if necessary w,x,y,z for the variables.

|7 0 4 |-13|
|0 1 -5 |11 |
|2 7 0 |6 | What is the answer to radical over 18 - radical over 8=

Thanks for all your help.