Arithmetic Mcqs

Q.  The average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?

a. 9
b. 8
c. 7
d. 6


ANSWER: See Answer
 
1 to 9 = 9 * 9 = 81

1 to 5 = 5 * 10 = 50

5 to 9 = 5 * 8 = 40

5th = 50 + 40 = 90 – 81 = 9
MCQs:  Find the average of the first 20 natural numbers?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average of 13 numbers is 60. Average of the first 7 of them is 57 and that of the last 7 is 61. Find the 8th number?
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MCQs:  A batsman makes a score of 64 runs in the 16th innings and thus increased his average by 3. Find his average after the 16th inning?
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MCQs:  The average marks of a class of 30 students is 40 and that of another class of 50 students is 60. Find the average marks of all the students?
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MCQs:  The average of 35 numbers is 25. If each number is multiplied by 5, find the new average?
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MCQs:  The average of 10 numbers is 23. If each number is increased by 4, what will the new average?
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MCQs:  The average of the marks of 12 students in a class is 36. If the marks of each student are doubled, find the new average?
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MCQs:  The average age of a group of 10 persons was decreased by 3 years when one person, whose age was 42 years, was replaced by a new person. Find the age of the new person?
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MCQs:  Find the average of the series : 312, 162, 132, 142 and 122?
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MCQs:  The sum of five numbers is 655. The average of the first two numbers is 85 and the third number is 125. Find the average of the two numbers?
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MCQs:  The average amount with a group of seven numbers is Rs. 20. If the newly joined member has Rs. 50 with him, what was the average amount with the group before his joining the group?
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MCQs:  A salt manufacturing company produced a total of 5000 tonnes of salt in January of a particular year. Starting from February its production increased by 100 tonnes every month over the previous months until the end of the year. Find its average monthly production for that year?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average weight of a group of boys is 30 kg. After a boy of weight 35 kg joins the group, the average weight of the group goes up by 1 kg. Find the number of boys in the group originally?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average runs scored by a batsman in 20 matches is 40. In the next 10 matches the batsman scored an average of 13 runs. Find his average in all the 30 matches?
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MCQs:  The average age of seven persons sitting in a row facing east is 28 years. If the average age of the first three persons is 21 years and the average age of the last three persons is 34 years, then find the age of the person sitting in the middle of the row?
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MCQs:  The average height of 35 boys in a class was calculated as 180cm. It has later found that the height of one of the boys in the class was wrongly written as 166 cm whereas his actual height was 106 cm. Find the actual average height of the boys in the class (Round off your answer to two decimal places)?
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MCQs:  The total marks obtained by a student in Physics, Chemistry and Mathematics is 150 more than the marks obtained by him in Physics. What is the average mark obtained by him in Chemistry and Mathematics?
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MCQs:  The present average age of a family of five members is 26 years. If the present age of the youngest member in the family is ten years, then what was the average age of the family at the time of the birth of the youngest member ? (Assume no death occurred in the family since the birth of the youngest).
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MCQs:  The average of four positive integers is 69. The highest integer is 93 and the least integer is 39. The difference between the remaining two integers is 28. Which of the following integers is the higher of the remaining two integers?
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