Average age

The average age of all people at the celebration was equal to the number of people present. After the departure of one person who was 29 years old, average age was again equal to the number present. How many people were originally to celebrate?

Result

n =  15

Solution: Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...): Be the first to comment! To solve this verbal math problem are needed these knowledge from mathematics:

Looking for help with calculating arithmetic mean? Looking for a statistical calculator? Looking for help with calculating roots of a quadratic equation? Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

Next similar math problems:

1. Average If the average(arithmetic mean) of three numbers x,y,z is 50. What is the average of there numbers (3x +10), (3y +10), (3z+10) ?
2. Theorem prove We want to prove the sentence: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
3. Median and modus Radka made 50 throws with a dice. The table saw fit individual dice's wall frequency: Wall Number: 1 2 3 4 5 6 frequency: 8 7 5 11 6 13 Calculate the modus and median of the wall numbers that Radka fell.
4. Variable Find variable P: PP plus P x P plus P = 160
5. Roots Determine the quadratic equation absolute coefficient q, that the equation has a real double root and the root x calculate: ?
6. Expression with powers If x-1/x=5, find the value of x4+1/x4
7. Solve 3 Solve quadratic equation: (6n+1) (4n-1) = 3n2
8. 75th percentile (quartille Q3) Find 75th percentile for 30,42,42,46,46,46,50,50,54
9. Evaluation of expressions If a2-3a+1=0, find (i)a2+1/a2 (ii) a3+1/a3
10. Algebra X+y=5, find xy (find the product of x and y if x+y = 5)
11. Discriminant Determine the discriminant of the equation: ?
12. Square root 2 If the square root of 3m2 +22 and -x = 0, and x=7, what is m? Find the roots of the quadratic equation: 3x2-4x + (-4) = 0. Children's tickets to the swimming pool stands x € for an adult is € 2 more expensive. There was m children in the swimming pool and adults three times less. How many euros make treasurer for pool entry? Equation ? has one root x1 = 8. Determine the coefficient b and the second root x2. 2 pipes can fill a tank in 35 minutes. The larger pipe alone can fill the tank in 24 minutes less time than the smaller pipe. How long does each pipie take to fill the tank alone? Jo's test scores on the first four 100 point exams are as follows: 96,90,76, and 88. If all exams are worth the same percent, what is the minimum test score necessary on his last exam to earn an A grade in the class (90% or better)?