the sum of two numbers is 120 and their difference is 30 find the number
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Heya !! ☺
Let the two numbers be x and y.
x + y = 120 __(1)
=> x = 120-y
x - y = 30 __(2)
Substituting x = 120-y in __(2)
=> (120-y) - y = 30
=> 120 -2y = 30
=> 2y = 120 - 30
=> 2y = 90
=> y = 90/2
=> y = 45
Putting y = 45 in __(1)
=> x + 45 = 120
=> x = 120 - 45
=> x = 75
Let the two numbers be x and y.
x + y = 120 __(1)
=> x = 120-y
x - y = 30 __(2)
Substituting x = 120-y in __(2)
=> (120-y) - y = 30
=> 120 -2y = 30
=> 2y = 120 - 30
=> 2y = 90
=> y = 90/2
=> y = 45
Putting y = 45 in __(1)
=> x + 45 = 120
=> x = 120 - 45
=> x = 75
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