Advertisements
Advertisements
प्रश्न
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?
पर्याय
78 kgs.
84 kgs.
82 kgs.
80 kgs.
Advertisements
उत्तर
80 kgs.
Explanation:
Here,
Average weight of three men X, Y and Z = 75 kgs.
∴ Total weight of three men X, Y and Z = 75 × 3 = 225 kgs.
A joins the group and average weight = 80 kgs
∴ Total weight of this group = 80 × 4 = 320 kgs.
∴ weight of A = 320 – 225 = 95 kgs.
∴ weight of B is 5 kg more than A.
∴ weight of B = 95 + 5 = 100 kgs.
Total weight of X, Y, A, and Z = 320 kgs.
Total weight of X, Y, AB and Z = 320 + 100 = 420 kgs.
Total weight of Y, Z, A and B = 85 × 4 = 340 kg.
∴ weight of X = (420 – 340) = 80 kgs.
APPEARS IN
संबंधित 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:
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:
10 sheep and 5 pigs were bought for ₹6,000. If the average price of a sheep is ₹450, find the average price of a pig.
The average age of ten persons learning yoga is 32 yrs. When the age of their instructor is added, the average age becomes 34 yrs. The age of their instructor is
The average marks of a student in ten papers are 80. If the highest and the lowest score are not considered the average is 81. If his highest score is 92, what is the lowest score?
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?
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?
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?
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 mean of 100 items was found to be 30. If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11, correct mean is
