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
Akbar will turn 50 when his son Jehangir turns 18. What will be Akbar's age when it will be exactly 5 times that of Jehangir?
Kiran‘s brother is 5 years older than her. Her father was 30 years old when Kiran's sister was born, while her mother was 28 years old when Kiran was born. If Kiran's sister was 2 years old when her brother was born, what was the age of their father when Kiran's brother was born?
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
Solve the following question and mark the best possible option.
The average age (in years) of a class is twice the number of students in the class. A student, X leaves the class and the average age is still twice the number of students in the class. Now another student Y leaves the class and the average is still twice the number of students in the class. If the ratio of the ages of X and Y is 19: 17, then find the average age of the class, if one more student Z of age 16 years leaves the class.
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.
Successive averages which are computed for a sequence of days/months/years at a time is called
The average price of 10 pens is Rs. 12 while the average price of 8 of these pens is Rs. 11.75. Of the remaining two pens, if the price of one pen is 60% more than the price of the other, what is the price of each of these two pens?
The captain of a cricket team of 11 players is 26 yr old and the wicket-keeper is 3 yr older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average of the team?
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?
A man bought 5 shirts at ₹ 450 each, 4 pairs of trousers at ₹ 750 each and I2 pairs of shoes at ₹ 750 each. What is the average expenditure per article?
