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- Question
- The average temperature of the first three days of the week is 25° C and that of the next three days is 27° C If the average ofthe whole week is 26.5° C, then the temperature of the last week of the week is
Options- A. 31.5° C
- B. 29.5° C
- C. 21° C
- D. 27.5° C
- Correct Answer
- 29.5° C
ExplanationLet the temperature on the last day of the week be x° C
Average of the week = ( 3 x 25 + 3 x 27 + x ) / 7 = 26.5
? 3 x 25 + 3 x 27 + x = 7 x 26.5
? 156+ x = 185.5
? x = 29.5
So, the temprature on the last day of the week is 29.5° C - 1. The average monthly income of a person in a certain family of 5 members is ? 1000. What will be monthly average income of a person in the same family, if the income of one person increased by ? 12000 per year?
Options- A. ? 1200
- B. ? 1600
- C. ? 2000
- D. ? 3400 Discuss
- 2. If the total sales for a business in a certain year were ? 132000. What were the sales in june, if june sales were half the monthly average?
Options- A. ? 8400
- B. ? 7200
- C. ? 5500
- D. ? 6300 Discuss
- 3. The mean marks of 30 students in a class is 58.5. Later on, it was found that 75 was wrongly recorded as 57. Find the correct mean.
Options- A. 57.4
- B. 57.5
- C. 58.9
- D. 59.1 Discuss
- 4. Out of three annual exams, each of maximum marks of 600, Lalit secured average marks of 55% and 60% in the first two exams. How many marks should Lalit score in 3rd test exam to make his overall average equal to 70%?
Options- A. 560
- B. 570
- C. 590
- D. 500 Discuss
- 5. The average age of all the members of a family is 25 yr. The average age of males is 30 yr while the average age of females is 20 yr. If the number of females in the family is 15, then find out the number of males.
Options- A. 20
- B. 30
- C. 15
- D. 18 Discuss
- 6. Five years ago, the average age of four men was 48 yr. Now, a new man joins and the average age increases by 2 yr. What is the age of the new man?
Options- A. 36 yr
- B. 42 yr
- C. 41 yr
- D. 38 yr Discuss
- 7. Average of a,b and c is 11, average of c,d and e is 17 average of e and f is 22 and the average of e and c is 17 . Find out the average of a, b, c, d, e and f.
Options- A. 151?3
- B. 162?3
- C. 171?2
- D. 152?3 Discuss
- 8. Mumbai gets wheat from different regions. If it gets 1200 kg from Nasik at the rate of ? 30 per kg, 1500 kg from Ratnagiri at the rate of ? 25 per kg and 2000 kg from Kolhapur at the rate of ? 32 per kg, find the average cost of wheat procured by Mumbai.
Options- A. ? 29 per kg
- B. ? 29.25 per kg
- C. ? 29.50 per kg
- D. ? 29.75 per kg Discuss
- 9. The average age of three boys is 15 years.if their ages are in the ratio 3: 5: 7, the age of the youngest boys is?
Options- A. 3 year
- B. 15 year
- C. 18 year
- D. 21 year Discuss
- 10. The average of odd number upto 100 is?
Options- A. 51
- B. 50
- C. 49.5
- D. 49 Discuss
Average problems
Search Results
Correct Answer: ? 1200
Explanation:
Total Income of the family per month
= 5 x 1000
= ? 5000
Increased amount per month = 12000/12 = ? 1000
Now, total amount of family income = ? 6000 per month
So, the average income of the family per month after increase = 6000/5
= ? 1200
Correct Answer: ? 5500
Explanation:
Monthly sale = yearly sale / 2
= 132000 / 2
= ? 11000
June's sale = monthly sale / 2
= 11000 / 2
= ? 1000
Correct Answer: 59.1
Explanation:
Correct mean = ( sum of total marks - 57 + 75 ) / 30
= ( 30 x 58.5 - 57 + 75 ) / 30
= (1755 + 18 ) / 30
= 59.1
Correct Answer: 570
Explanation:
Total required marks in the three examinations = (3 x 600 x 70)/100 =1260
Marks secured in first examination = 55% of 600 = ( 600 x 55)/100 =330
Marks secured in second examination = 60% of 600 = ( 600 x 60)/100 =360
Thus, the required marks in third examination = 1260 - (330 + 360)
= 1260 - 690
= 570
Correct Answer: 15
Explanation:
Let number of males = y
Then, total number of family members = 15 + y
Sum of age of family members = sum of age of males + sum of age of females
25(15 + y) = 30y + 15x20
? 375 + 25y = 30y + 300
? 5y = 75
? y = 15
Correct Answer: 38 yr
Explanation:
Sum of the ages of 4 men five years ago
= 48 x 4
=192 yr
And sum of present ages of the four men
= 192 + 5 x 4
= 212 yr
Now ( 212 + Age of the new man ) / 5 = 50
? Age of the new man = 50 x 5 - 212
= 38 yr.
Correct Answer: 152?3
Explanation:
a + b + c = 11 x 3 = 33 .....(i)
c + d + e = 17 x 3 = 51 .....(ii)
e + f = 22 x 2 = 44 .....(iii)
e + c = 17 x 2 = 34 .....(iv)
From Eqs. (ii) and (iv), we get
34 + d = 51
? d = 17
Now adding Eqs. (i), (ii), (v), we get
a + b + c + d + e + f = 33 + 44 + 17 = 94
? Average of a, b, c, d, e and f = 94/6 = 152?3
Correct Answer: ? 29.25 per kg
Explanation:
Average cost =( w1x1 + w2x2 + w3x3 ) / (w1 +w2 +w3)
= ( 1200 x 30 +1500 x 25 + 2000 x 32) / ( 1200 + 1500 + 2000 )
= 137500 / 4700
= ? 29.25 per kg
Correct Answer: 3 year
Explanation:
Age of A : age of B : age of C = 3 : 5 : 7
So the average age of 3 boys (3x + 5x + 7x ) /3 = 15
?15x= 15 x 3
? x= 3
Correct Answer: 50
Explanation:
sum of odd number upto 100 = 1 + 3 + 5 + 7+....+ 95 + 97 + 99
=(1+99) + (3+97) + (5+95) +.... upto 25 terms
= 100 + 100 + 100 +.... upto 25 terms
= 2500
Average = 2500 /50
= 50
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