exam Maths Puzzle Numerical Ability

the square root of 3 over 2

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exam Other Question

Find the perimeter of the figure if two sides of it are 10inches, 5sides of it are 20inches and 1 side of it is 60 inches.
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if you osve this,can you please break down the steps and explain what to do because i dont know what to do when you 3 equations like these:

A=11B
A+x=5(B+x)
A+x+5=3(B+x+5)