mathematics
posted by monica .
a person has 1&2 rupee coins with him
total amount with him is 75.total number of coins with him is 50.find how many 1&2 rupee coinsare there with him.

Solve these two equations for x and y:
x + y = 50
x + 2y = 75
(y is the number of 2 rupee coins; x is the number of 1 rupee coins)
Clearly y = 25, and x is also 25. 
he has 25 one rupee coins and 25 two rupee coins together he has 50 coins with total amount of 75 rupees
1*25+2*25=25+50=75 rupees