There are black counters and blue counters in a bag in the ratio 5:4 14 blue counters are added and the ratio becomes 2 : 3
Work out how many black counters there are in the bag.
black counters
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The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

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Student representatives surveyed their classmates on their preference of a school mascot for a new school. the results are shown in the table below. which pair of samples seems most representative of student preference?