Question
Average of 14 observations calculated by a student was
70 but when he again went through his observations he realised that he took value of three observations as 55, 63 and 51 in place of 74, 84 and 45 respectively and also realised that total observations taken by him was 13. Find the original average of all observations taken by him.Solution
Sum of 14 observations = 14 × 70 = 980 Original average = {980 + (74 + 84 + 45) - (55 + 63 + 51)}/13 = 1014/13 = 78
Quantity of water in a 360 litres mixture (Milk + Water) is 80 litres less than the quantity of milk in it. Find the quantity of water to be mixed so t...
A mixture measuring 720 ml consists of milk and water in an 8:7 ratio. How much water should be added to ensure that the water content is 12.5% greater ...
When 10 litres of water is added to a mixture of milk and water, the ratio of quantity of milk and water becomes 4:5. Instead, if 20 litres of water had...
In a 60-liter mixture of petrol and diesel, the ratio of petrol to diesel is given as p:1. When 8 liters of diesel is added to th...
A 450 ml solution is composed of water and glucose mixed in the ratio of 8:7. Determine the amount of glucose that must be added to the solution so that...
Mixture ‘E’ of salt and water contains salt and water in ratio 6:5, respectively. What will be the ratio of salt to water in mixture ‘E’ when qu...
Quantity of milk is 20% more than that of water in 220 litres mixture (milk + water). If 22 litres milk is added, then find the quantity of milk in the ...
A mixture of lime and water contains 3a liters lime and (a + 40) liters water. Upon adding 20 liters more water, the ratio of quantity of water to that ...
Mixture 'A' consists of 'm' liters of milk, while mixture 'B' includes '11 + m' liters of milk. Determine the ratio in which mixture 'B' to mixture 'A' ...
- A vessel contains mixture in which 25% is water and rest is milk. If 40 liters more water added in vessel, then quantity of water becomes 35% of mixtu...
