book Maths Puzzle Numerical Ability

Find the discriminant and describe the natue of the roots.
3x^2 + 7x - 10 = 0

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5 1/2 divided by 2 2/5 A truck carries a load of 85 boxes; some are 30 lbs and the rest are 25 lbs. If there are 3 times as many 30 lb boxes as 25 lb boxes, and the total weight of the boxes is 2245 lb,