Question 987316
Hi there,
A number = 'x'
Double the number = 2x
Take away 20 = 2x - 20
You get 50 = 2x - 20 = 50
2x - 20 = 50
Collect like terms
2x = 50 + 20
2x = 70
x = 35
Number is 35
Hope this helps :-)