exam Maths Puzzle Numerical Ability

why can a scalene triangle, that has the measurements of 7yds, 16yds, and 11yds, be used as in actual measurements. is it because the two smaller sides have to add up to be greater

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exam Other Question

[2x^2 - 5x + 3]/ [3x^2 - 7x +4] divided by [2x^2 + x - 6]/ [3x^2 + 2x - 8]

The answer I got is x +1 / x - 1
Chessboard Parable. Use to answer exercise. Assume each grain of wheat weighs 1/7000 pound (2B for grain unit of weight).

10. How many grains of wheat should be placed on square