the average age of a group of person going for a picnic is 16 years. twenty new person with the average age of 15 years joined the group on the spot. Due to that, the average age of the group became 15.5 years. what is the number of persons initially going for the picnic.
A. 20
B. 25
C. 23
D. 56
সঠিক উত্তরঃ
A.
20
Explanation:
Related Questions (Any University/Year)
- If x #0, then (x+7)/7x-1/x = ?
- If a, b and c are 3 consecutive integers in that order, which of the following has the lowest value?
- The ratio of labor cost and materials cost for making a radio is 2:7. If the cost price is 90% of the selling price which is Tk. X, what is the labor cost per radio?
- Three business people wish to invest in a new company. Each person is willing to pay one third of the total investment. After careful calculations, they realize that each of them would pay BDT 7,200 less if they could find two more equal investors. How much is the total investment in the new business?
- If 16% of 40% of a number is 8, the number is :
- If Mr. Rahim receives BDT 1500 as a profit from an investment which was made 5 years ago. If the rate was 6% per annum. then what was the amount of investment?
- The Value Added Tax of retail sales is 5% If a customer pays BDT 150 VAT. then what is the value of his / her total shopping bill ?
- A discount of 20 percent on an order of goods followed by a discount of 10 percent amounts to
- After X% of their games had been played. Leicester had won 40% of their games. They won 30% of the rest of the games. In terms of X which of the following expresses the percentage of games Leicester had won at the end of the season?
- এক মণ ধানে চাল ও তুষের ৭:৩ হলে এতে শতকরা কি পরিমাণ চাল আছে?
- A CD player and a DVD player have the same price. If the price of the CD player goes up by 10% and that of the DVD player is decreased by 5%, how much more will it cost to buy 5 CD players and 5 DVD players?
- If x is less than y, which of the following numbers must be greater than x and less than y?(I). (x+y)/2 (ll). xy/2 (lll). x2-y2
- The number of students on each section of a school is 24. After admitting new students, three new sections were started. Now, the total number of sections is 16 and there are 21 students in each section. How many new students were admitted?
- During a particular day, x number of applicants came to IBA to submit their applications before lunch. Of them 70% were male applicants. On the same day, y number of applicants came to submit their application after lunch and all of them were male applicants. On that particular day , the ratio of male applicants to female applicants was 4:1. Calculate y in terms of x.
- If -4 <x< 12 and -2 < y < 13 which of the following numbers represent the of maximum value (y-x)?'
- n denotes the number obtained when n is rounded to the nearest tenth. For example 4.31=4.3 0.089-1.135=
- A box contains 24 red socks and 43 green socks. How many green socks must be removed from the box so that 60% of the socks in the box will be green?
- The average of 5 numbers is 40. If 2 more numbers, with an average of 21, are added to these numbers, what will be the average of the combined 7 numbers?
- A train takes 10 seconds to cross a pole and 20 seconds to cross a platform of length 200 m. What is the length of train?
- If 7x - 5y = 13 and 2x7y: = 26, then 9x -12y=?