Advertisements
Advertisements
प्रश्न
Choose the most appropriate option.
The age of father 10 years ago was three times the age of his son. After 10 years, father’s age is twice that of his son. The ratio of their present ages is:
विकल्प
7:3
7:4
11:7
9:5
Advertisements
उत्तर
7:3
Explanation:
Let son's age 10 years ago = x
Father's age 10 years ago = 3x
According to question,
2(x+20) = (3x+20)
⇒ 2x+40 = 3x+20
∴ x = 20
∴ 10 years ago, father's age = 3x = 3 × 20 = 60 years and
son's age = x = 20 years
∴ Ratio of present age = 70 : 30 = 7 : 3.
APPEARS IN
संबंधित प्रश्न
Solve the following question and mark the best possible option.
The average marks scored by two groups X and Y of students are 70 and 75 respectively. Four students are moved from group Y to group X, thereby interchanging the average marks of the two groups. Find the total number of students in two groups put together, if the average marks scored by the four students who moved are 85.
Four years ago, the ages of Ritu and Reena were in the ratio 5: 6 respectively. Eight years from now the respective ratio of their ages will be 8: 9. What is the sum of their ages at present?
The sum of ages of a mother and daughter is 45 years. Five years ago, the product of their ages was four times the mother's age at that time. The present age of the mother is
The average height of 10 students in a class is 105 cms. If 20 more students with an average height of 120 cms join them, what will be the average height be?
A car owner buys petrol at ₹ 7.50, ₹ 8 and ₹ 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol, if he spends ₹ 4000 each year?
The sum of the ages of six children born at an interval of 5 yr each is 93 yr. What is the age of the youngest child?
In a family, the father is 5 years older than the mother and the mother's age now is thrice the age of the daughter. The daughter is now 10 years old. What was the age of the father when the daughter was born?
The average age of 5 members of a family is 20 years. The youngest member of the family is 4 years old. The average age of all the members of the family excluding the youngest member is
If the sum of a few numbers is 450 and their mean is 50 if another number 100 is included, the mean would become
The average of three numbers is 28. The first number is half of the second and the third number is twice the second. The third number is
