Advertisements
Advertisements
Question
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:
Options
7:3
7:4
11:7
9:5
Advertisements
Solution
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
RELATED QUESTIONS
Ms. Jhulan Goswami scores 102 runs in the 18th innings of her career and thus increases her average by 5. After the 18th inning, her average is:
The average age of three friends A, B, and C is 7 years. Five years later, the average age of A and C will be 1½ years more than B's age then. How old will B be 10 years hence (in years)?
Choose the most appropriate option:
A library has an average of 510 VIS1tors on Sunday and 240 on the other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is
Choose the most appropriate option.
The average weight of three men ‘X’, ‘Y’ and ‘Z’ is 75 kgs. Another man ‘A’ joins the group and the average weight now becomes 80 kgs. If another person ‘B’ whose weight is 5 kgs more than ‘A’ replaces ‘X’, then the average weight of ‘Y’, ‘Z’, ‘A’ and ‘B’ will be 85 kgs. What is the weight of ‘X’s?
Beena got married 8 years ago. Today, her age is `1 1/4` is times her age at the time of marriage. If her daughter's age is 1/10 times her age, then her daughter's age is:
The average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What must be the weight of the new person?
In the first 10 overs of a cricket game, the run rate was only 3.2. What should be the run rate in the remaining 40 overs to reach the target of 282 runs?
There were 35 students in a hostel. Due to the admission of 7 new students, the expenses of the mess were increased by ₹ 42 per day while the average expenditure per head diminished by ₹ 1. What was the original expenditure of the mess?
At present Meena is eight times her daughter's age. Eight years from now, the ratio of the ages of Meena and her daughter will be 10 : 3, respectively. What is Meena's present age?
If the sum of a few numbers is 450 and their mean is 50 if another number 100 is included, the mean would become
