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.
There is insufficient information for us to even begin to understand this question. Please edit the question to include more context or relevant information. There is something missing in "... half the sum of [???] and y decreased ...".
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
Well, if you're three years older than your sister now, you must be feeling pretty ancient. In 20 years, your sister will be twice as old as you are now, which means she'll be catching up to your current age. So, if you're feeling old now, just wait until your sister starts lapping you in the age race.
y-6
When 25 is decreased by 20% the result 20.
450 decreased 20% results in: 360