exam Maths Puzzle Numerical Ability

t/9-7=-5

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exam Other Question

5x=3x
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7 = 4
crystal sells coffee. her special blend is a combination of french roast @ $7.50 a lb. and kona deluxe @ $11.50 a lb. how many pounds of kona should she mix with 12 lbs. of french roast to get a blend to be sold for $10.00 a lb.?