Q121. The present age of a father is 3 times that of his son. After 12 years, the father’s age will be twice that of the son. Find the present age of the son.
Q122. Five years ago, the age of a father was 7 times the age of his son. Five years hence, the father’s age will be 3 times that of his son. Find the present age of the father.
Q123. The ratio of ages of A and B, 4 years ago, was 3:4. Six years hence, the ratio of their ages will be 4:5. Find the present age of A.
Q124. A mixture of 40 litres contains milk and water in the ratio 7:1. How much water must be added to make the ratio 7:2?
Q125. In what ratio must a person mix tea worth Rs. 60/kg and Rs. 90/kg so that the mixture is worth Rs. 75/kg?
Q126. How many kg of sugar costing Rs. 40/kg must be mixed with 30 kg of sugar costing Rs. 30/kg so that the mixture is worth Rs. 32/kg?
Q127. The average age of a class of 30 students is 12 years. Including the teacher’s age, the average becomes 13 years. Find the teacher’s age.
Q128. A father’s age is 4 times his son’s age. After 20 years, the father’s age will be twice the son’s age. Find the father’s present age.
Q129. A bag contains Rs. 1, 50-paise and 25-paise coins in the ratio 5:6:8. If the total amount is Rs. 210, find the number of 50-paise coins.
Q130. Vessel A contains milk and water in the ratio 1:2, and vessel B contains milk and water in the ratio 4:1. In what ratio should quantities from A and B be mixed to get a mixture with milk and water in equal ratio (1:1)?
