book Maths Puzzle Numerical Ability

what is the difference between a scalene triangle and a right triangle?

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book Other Question

2x^2+5x>12

Having trouble with this one.
MinZ = 10x1 + 20x2
subject to x1=x2>=12
2x1 +5x2 >=40
x1,x2>=0
what is minimum cost Z=?
ans to one decimal place