Algebra (equations and formulae) The larger of two numbers is four times the smaller, and their sum is 85. Find the two numbers. I need a brief working out...

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Let the two numbers be 'x' & 'y'

Now, as per the question 

y = 4x ............(1)

Also, x+y = 85......(2)

Using the value of y from (1) in (2) we get

x + 4x = 85

or, 5x = 85 

or, x = 17

Thus, y = 4x = 4*17 = 68

Hence the two numbers x & y are 17,68

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