exam Maths Puzzle Numerical Ability

Coffee powder costing $12.75 per kg is mixed with coffee powder costing $8.95 per kg in the ratio 5:7 by weight. The mixture sold at $12 per kg. Find the gain percent.

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exam Other Question

find the number of sides (N) in a regular convex polygon with the exterioe angles measuring 120*(degrees)? Q) A computerized switch board in the telephone exchange receives an average
of 4 calls/min . Find the probability that
(a) the interval of time between successive calls