0% 0 votes, 0 avg 0 Total Time: 10 minutes Your time is over! Try again. Average Test yourself in Average Math Question! You have only 10 minutes to complete the test and if you do not answer any question within the allotted time, it will be counted as incorrect. You can skip questions by clicking "NEXT" button and go back to previous questions by "PREVIOUS" button. You need to get minimum 50% marks to pass the quiz. Click on the "START" button to participate in the quiz. Arithmetic Operation 1 / 10 The average age of a class is 40 years. 12 new students with an average age of 32 years join the class, thereby, decreasing the average by 4 years. What is the original number of students of the class? 24 12 21 16 Oops! Your answer is wrong. Wow! Your answer is correct. Explanation:Let the original number of students of the class be xThen Total age of x students = 40x yearsTotal age of 12 new students = 12 × 32 = 384 yearsNew average of (x + 12) students = 40 − 4 = 36 yearsTherefore, total age of (x + 12) students = (x + 12) × 36 = (36x + 432) yearsThus, 40x + 384 = 36x + 432⇒ 4x = 48⇒ x = 12 Arithmetic Operation 2 / 10 The average age of husband, wife and their child 3 years ago were 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is: 48 years 40 years 72 years 36 years Oops! Your answer is wrong. Wow! Your answer is correct. Explanation:Sum of the present ages of husband, wife and child = (27 × 3 + 3 × 3) years = 90 years.Sum of the present ages of wife and child = (20 × 2 + 5 × 2) years = 50 years.Husband's present age = (90 - 50) years = 40 years. 3 / 10 The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero? 18 20 24 19 Oops! Your answer is wrong. Wow! Your answer is correct. Explanation:Let, the 20 numbers be a1, a2, ... …, a20Given that, average of 20 numbers is zero.Therefore, (a1 + a2 + ... + a20)/20 = 0⟹ a1 + a2 + ... + a20 = 0⟹ a1 + a2 + ... + a19 = − a20Therefore, at the most 19 numbers can be greater than zero. Arithmetic Operation 4 / 10 The average of runs of a cricket player in 10 innings was 32. How many runs must he make in his next innings so as to increase his average of runs by 4? 46 72 76 74 Oops! Your answer is wrong. Wow! Your answer is correct. Explanation:Average = Total runs / Number of innings = 32So, Total runs = Average x Number of innings = 32 × 10 = 320.Now increase in average = 4 runs. So, new average = 32 + 4 = 36 runsTotal runs = new avg x new number of innings = 36 × 11 = 396Runs made in the next innings = 396 - 320 = 76 Arithmetic Operation 5 / 10 Find the average of the numbers which are as follows: 12, 5, 0, 13, 10 8 10 40 12 Oops! Your answer is wrong. Wow! Your answer is correct. Explanation:Average = Sum of Values /Number of ValuesTherefore, Average = (12 + 5 + 0 + 13 + 10) / 5 = 8 Multiples 6 / 10 The average of the first five multiples of 3 is – 36 9 18 45 Oops! Your answer is wrong. Wow! Your answer is correct. Explanation:Average = Sum of Values/Number of ValuesFirst five multiples of 3 is: 3, 6, 9, 12, 15Average = (3 + 6 + 9 + 12 + 15)/5 = 9 Prime Number 7 / 10 Average of all prime numbers between 30 to 50 – 39.80 39.00 40.40 40.00 Oops! Your answer is wrong. Wow! Your answer is correct. Explanation:Average = Sum of Values/Number of ValuesPrime numbers between 30 and 50 are: 31, 37, 41, 43, 47The average of prime numbers between 30 to 50 will be:(31 + 37 + 41 + 43 + 47)/5 = 199/5 = 39.80 Arithmetic Mean 8 / 10 The mean is found by ___________________ all of the numbers and then ____________________ by the number of items. Adding & Adding Adding & Dividing Adding & Multiplying Adding & Subtracting Oops! Your answer is wrong. Wow! Your answer is correct. Explanation: Definition of Mean. Arithmetic Operation 9 / 10 The average of 5 quantities is 6. The average of 3 of those 5 quantities is 8. What is the average of the remaining two quantities? 3 6 2 4 Oops! Your answer is wrong. Wow! Your answer is correct. Explanation:The average of 5 quantities is 6.Therefore, the sum of the 5 quantities is 5 × 6 = 30.The average of three of these 5 quantities is 8.Therefore, the sum of these three quantities = 3 × 8 = 24The sum of the remaining two quantities = 30 - 24 = 6.Average of these two quantities = 6/2 = 3. Arithmetic Operation 10 / 10 The average of 16 numbers is 8. If 2 is added to every number, the new average will be: 16 12 20 10 Oops! Your answer is wrong. Wow! Your answer is correct. Explanation:Average of 16 numbers = 8Thus, total of 16 numbers = 16 × 8 = 128When 2 is added to every number then total of 16 numbers increases by 16 × 2 = 32Thus, new total of 16 numbers = 128 + 32 = 160New average of 16 numbers = 160 / 16 = 10 Please enter the required information and tap on the "See Result" button to view your results. Don't worry! Your information will be safe. For details check our Privacy Policy. Your score isThe average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Please give a rating and share it with your friends. Anonymous feedback Send feedback
