@pakkapagal said:why did you choose 130 ?
less than 131
In a class, two students weighing 54 and 62 kgs are replaced by two new students weighing 58 and 64 kgs. As a result the average weight of the class increases by one fourth of kg. How many students are there in the class???
@jashholmes said:In a class, two students weighing 54 and 62 kgs are replaced by two new students weighing 58 and 64 kgs. As a result the average weight of the class increases by one fourth of kg. How many students are there in the class???
24?
@jashholmes said:In a class, two students weighing 54 and 62 kgs are replaced by two new students weighing 58 and 64 kgs. As a result the average weight of the class increases by one fourth of kg. How many students are there in the class???
S/N=A
(S+6)/N=A+1/4
N=24
(S+6)/N=A+1/4
N=24
@adwaitjw Yeah! How???
I don't know why majority of the people only reply with the final answer and not the solution!!!
I don't know why majority of the people only reply with the final answer and not the solution!!!
The average age of 25 man increases by 2 years when a person 25-year-olds is the replaced with a new man. How old is a new person???
@jashholmes said:In a class, two students weighing 54 and 62 kgs are replaced by two new students weighing 58 and 64 kgs. As a result the average weight of the class increases by one fourth of kg. How many students are there in the class???
Difference between weights=6
6=n*1/4
n=24
@jashholmes said:@adwaitjw Yeah! How???I don't know why majority of the people only reply with the final answer and not the solution!!!
Actually wanted to knw if its correct first..Total increase in weight of class is 6 kg.
Increase in 6 kg results in quarter kg increase in avg. So for increase by one Kg avg weight total increase should be 24 kg.
i.e. one Kg increase per student will increase avg by 1 kg.
So 24 students.. :)
@jashholmes said:The average age of 25 man increases by 2 years when a person 25-year-olds is the replaced with a new man. How old is a new person???
Difference in weights of the two men=25*2=50
50=x-25
x=75
In a city 60 % of the population owns a car, 75 % owns a rickshaw, 80 % owns a scooter, and 95% owns a bicycle, what person at least owns all four of them???
@jashholmes said:The average age of 25 man increases by 2 years when a person 25-year-olds is the replaced with a new man. How old is a new person???
75 years?
@jashholmes said:@sameersapre23 How???
Oh let the total age of 24 persons be "y" so the total age of the 25 persons will be
(y+25)
and now average age will be
(y+25)/25= K (average age of 25 persons)----------------------A
now a new person is placed replacing 25 year old person
so
(y+x)/25= (K+2) (as new averge increases by 2)-----------------------------B
solve the the equation A n B and get the value of x which is the age of newly aded person
Climbing up on a moving escalator,Ram can reach the first floor frm ground floor in 30 sec.If he climbs up on stationary stairs,he takes 20 secs to reach first floor.How many secs will he take for the same trip if he climbs up with his standard pace in the direction of an escalator going up?
From a bowl containing 68 marbles, of which half are red and half are blue, Allison takes 5 red and 7 blue marbles. She takes an additional 17 marbles from the jar. What is the least number of these additional marbles that must be blue in order for there to be more red marbles than blue marbles among the remaining marbles in the bowl?
a)6
b)7
c)8
d)9
a)6
b)7
c)8
d)9
@jashholmes said:The average age of 25 man increases by 2 years when a person 25-year-olds is the replaced with a new man. How old is a new person???
LET X1+X2+..X25/25=Y(AVG)
((X1+X2+..X25)-25+A)/25=Y+2,
Y-(25-A)/25=Y+2,
solving A=75