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we have present age of Arthur’s wife & child
but to know Arthur age we should have age of other members.
So, age of Arthur at the time of his marriage can’t be determined

Since we know difference b/w ages of 2 persons is constant.
So if child age (present) = x
Age of wife = x+16

Step (i): Let x be the number of boys and y be the number of girls.
Given total number of boys and girls = 100
Step (ii): A boy gets Rs. 3.60 and a girl gets Rs. 2.40
The amount given to 100 boys and girls = Rs. 312
Step (iii):
Solving (i) and (ii)
= 40
Number of girls = 40

Let P be the total profit.
%
Had the profit been divided in the ratio of their investment,

The earning of A & B is 16800 and 11200 according to the given condition.
If the profit been divided in the ratio of their investment B received
Let the investment of A is x

X, Y, and Z invest in partnership in the ratio 4 : 7 : 11. If in the end the profit was distributed in the ratio 24 : 35 : 77, then the ratio of the time for which they were invested is:

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