Twice the sum of 'x' and 'y' . . . 2(x+y) The sum of twice 'x' and 'y' . . . (2x+y)
When 25 is decreased by 20% the result 20.
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2(x+y)=2x+2y
(2)x=Y-4
The sum of x and y decreased by their product is (x + y)- xy.
The expression is: 2y -20
y-8
Twice the sum of 'x' and 'y' . . . 2(x+y) The sum of twice 'x' and 'y' . . . (2x+y)
x+y=20 x=2y-2 2y-2+y=20 y-2=20 y=18 x=2
2(x+y) is twice the sum of x and y, and 2x+y is the sum of twice x and y
320 decreased by -20 = 300
The difference between 72 and 16
y-6
Let you be x years old now Let your sister be y years old now Right now: x+3 = y In 20 years you are x+20 and your sister is y+20 years old (y+20)=2x plugging in y from the first equation: [(x+3)+20]=2x x+23=2x x = 23 y = 23+3 = 26 To check, the answer if you are 23 now an your sister is 26 now in 20 years your sister will be 46 which is twice 23.
When 25 is decreased by 20% the result 20.
450 decreased 20% results in: 360