i think its none..
10(x-3)=9x+p....p=age of younger guy..
solving it,we get x=30+p..for different values of x..we get different p..
am i correct..?
amitshanky Saysyou are correct can you please explain 2nd one:)
1)the average weight of n boys in a group is 36 kg.if 20 other boys whose average weight is 30 kg join the group,the avg weight of the group would be the same as what it would be if 5 boys whose average weight is 40 kg leave the group.find N:-
10,15,30,25
A and B have some guavas divided among themselves. A says to B "If i give 25% of the guava I have, I will still have 2 more guavas than u have." To this B says, If u give me guavas equal to 70% of what I have now, I will have 4 more guavas than u have". What is the total number of guavas that they have?
80
64
36
88
A has x
B has y
I am bit confused.
Stmt1-> If i give 25% of the guava I have, I will still have 2 more guavas than u have.
3x/4 = y + 2
3x = 4y + 8
Had it been this way
Stmt1-> If i give 25% of the guava I have, I will still have 2 more guavas than u will have.
3x/4 = y + 2 + x /4
x = 2y + 4 ------
Stmt2-> If u give me guavas equal to 70% of what I have now, I will have 4 more guavas than u have
1.7y = x + 4
Now acc to me eqs are :
3x = 4y + 8 => 30x = 40y + 80 ---eq1
17y =10 x + 40=>51y = 30x + 120 ---eq2
51y = 40y + 200
11y = 200
y = 18.18 ~ 18
x = 88/3 = 29.7
my ans 48
Where am i going wrong ???
A locomotive engine runs at a speed of 50 kmph when no compartment is attached to it. For every new compartment that is attached to it, the speed of the train is reduced by 10% of the earlier speed. At most, how many compartments can be attached so that the train can cover a distance of 180 km in a maximum of 8 hours?
7
5
6
8
Found the problem confusing.
A and B have some guavas divided among themselves. A says to B "If i give 25% of the guava I have, I will still have 2 more guavas than u have." To this B says, If u give me guavas equal to 70% of what I have now, I will have 4 more guavas than u have". What is the total number of guavas that they have?
80
64
36
88