The percentage increase in the area of a rectangle , if each of its sides is increased by 20%, is :

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The area of a rectangular classroom is x²-25. Which of the following binomials could represent the length and the width of the room?

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In a group of 15 , 7 have studied Latin , 8 have studied Greek, and 3 have not studied either . How many of these studied both Latin and Greek ?

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If the operation ^ is defined by the equation x ^ y = 2x + y, what is the value of a in 2 ^ a = a ^ 3 ?

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A student scored 80 marks in his first test. After taking the third test, his average dropped from 82 to78 . What is the average of his 2nd and 3rd tests ?

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If 13 =13w / ( 1 - w ), then ( 2w )2 =

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