(CLASS 10)Q: A two digit no is 3 more than 4 times the sum of its digit.If 18 is added to the no the digits are reversed.Find the no.
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Answered by
2
35 is the answer.
Equations according to question will be 3+4(x+y)=10x+y and 18+ 10x+y=10y+x
Equations according to question will be 3+4(x+y)=10x+y and 18+ 10x+y=10y+x
mohit39karn:
thanks for answering
Answered by
1
Two digit number = 10x + y
10x + y = 4x + 4y + 3
6x = 3y + 3
6x - 3y = 3 -(1)
10x + y + 18 = 10y + x
9x + 18 = 9y
9x - 9y = -18
x - y = -2. - (2)
solving both equation simultaneously,we get
x = 3
y = 5
Two digit number = 10x + y
= 10*3 + 5
= 35
10x + y = 4x + 4y + 3
6x = 3y + 3
6x - 3y = 3 -(1)
10x + y + 18 = 10y + x
9x + 18 = 9y
9x - 9y = -18
x - y = -2. - (2)
solving both equation simultaneously,we get
x = 3
y = 5
Two digit number = 10x + y
= 10*3 + 5
= 35
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