exam Maths Puzzle Numerical Ability

I'm stuck again in the percent department,I have some more problems I need help with,I guess this is where my weakness is in, in math.The first problem is the cost of a computer de

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exam Other Question

help me solve please:
y+3x=9

i dont get how to solve/get for x & y.
How to solve this problem?

Problem: Use the digits 1-9 in order. Insert operation signs and add grouping symbols to got the value of 100.