after 15 years Mona will be 5 times as old as she was 5 years ago determine present age
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Let mona's present age be a
Mona's age 5 years ago = a - 5
Mona's age after 15 years = a + 15
According to question,
a + 15 = 5 (a - 5)
=> a + 15 = 5a - 25
=> 5a - a = 15 +25
=> 4a = 40
=> a = 10
Mona's present age = 10 years
Mona's age 5 years ago = a - 5
Mona's age after 15 years = a + 15
According to question,
a + 15 = 5 (a - 5)
=> a + 15 = 5a - 25
=> 5a - a = 15 +25
=> 4a = 40
=> a = 10
Mona's present age = 10 years
gaurav2013c:
a + b = 13 ------(2)
on adding equation 1 and 2, we get
2a = 16
a = 8
b = 5
number = 85
we have amount rupees 300 in the denomination of Rupees 1 rupees2 and rupees 5 the number of Rs 2 coins is three times the number of rupees 5 coins and the total number of coins is 160 find the number of coins of each type we have
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