The ages of Hari and Harry are in the ratio 5:7. Four years from now the ratio of their ages will be 3:4. Find their present age
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1 answer:
Answer:
Hari is 20; Harry is 28
Step-by-step explanation:
The ratio in 4 years is equivalent to the ratio 6:8, which has each of the original ratio unit numbers increased by 1. That means each of those ratio units stands for 4 years, and the present ages are ...
Hari: 5·4 = 20
Harry: 7·4 = 28
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<em>Conventional method of solution</em>
If you like, you can write equations for the ages of Hari (x) and Harry (y):
x/y = 5/7
(x+4)/(y+4) = 3/4
These can be solved a variety of ways. For some methods, it may be useful to write them in standard form:
- 7x -5y = 0
- 4x -3y = -4
These have solution (x, y) = (20, 28).
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Answer with explanation:
Given : Number of men = 4
Number of women = 6
Total people =
Total number of ways to make a committee of five people from 10 persons :-
a) Number of ways to make committee that has exactly four women :
The probability that committee has exactly four women :
b) Number of ways to make committee that has at-least four women :
The probability that committee at-least four women :
c) Number of ways that committee has more than 4 women :-
The probability that committee has more than 4 women :-
Now, the probability that committee has at most four women :-