Question
A mixture contains 30 ml water and rest ‘x’ ml milk.
When 0.6x ml of water is added to the mixture, the quantity of water becomes 2/5th of the mixture. Find the value of ‘x’.Solution
According to the question,
Quantity of water after addition of 0.6x ml water = (30 + 0.6x)
Total quantity of the mixture = 30 + 0.6x + x = (30 + 1.6x)
Therefore,
(2/5)(30 + 1.6x) = (30 + 0.6x)
Or, 60 + 3.2x = 150 + 3x
Or, 0.2x = 90
Or, x = 450
The mean of a set of 8 numbers is 80. If the average of the first four numbers and the last two numbers is 90 and 60, respectively, and the ratio of the...
- 6 students ‘P’, ‘Q’, ‘R’, ‘S’, ‘T’ and ‘U’ took part in a quiz competition. The average score of all 6 was 72 marks. The average sc...
The average of the first four numbers is 'x+30', the average of the next 10 numbers is 'x', and the average of the remaining 6 numbers is 'x−20'. If t...
Average of 15 observations calculated by a student was 65 but when he again went through his observations he realised that he took value of three observ...
- The average of two numbers is 12 more than the smaller number among them. If the greater number is 150% more than the smaller number, then find the sum of ...
The average height of each student in a class of 15 students is 160 cm. If 6 new students joined the class, then the average height of the each student ...
The average number of books sold by Viren in first 4 months is 3600 and in first 5 months is 4200. If the number of books sold by him in 6th ...
The average daily income of a daily wage worker, in the month of February is Rs. 120. If his average income on 1st 12 days of the month is Rs. 80 and on...
The average wage of a group of 49 labourers is Rs. 650. If 4 persons receiving average wage of Rs. 500 leave the group and 2 persons receiving average w...
The average age of a class of 24 girls is 16 years. If 6 new girls having average age of 12 years join the class, then the average age of the class beco...
Relevant for Exams:
