book Maths Puzzle Numerical Ability

Guatemalan coffee sells for $5.00 a pound and Mexican coffee sells for $6.40 a pound. A blend contains 10 fewer pounds of Mexican than Guatemalan and sells for $5.63 a pound. How

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book Other Question

Two trains, 200 and 160 meters long take a minute to cross each other while traveling in the same direction and take only 10 seconds when they cross in opposite directions. What ar what does x here equal?
-2.7=-1.3+0.7x