17 because 4 x 1.5 = 6, 50 / 1.5 = 33.33
(a)
3
1
5
2
3
9
1
-1
-1
Total: 22
(b) The actual total is $21.77 which rounds to $22, the same as the estimate, so the estimate is reasonable.
The sum of two numbers:
x + y = 108
The difference of the same two numbers:
x - y = 78
We can use substitution to figure out x and y:
x - y = 78 can be changed to x = 78 + y
We can plug this into the first equation:
78 + y + y = 108
78 + 2y = 108
2y = 30
y = 15
Now solve for x using any of the two equations. I'll use the first equation since it's easier:
x + 15 = 108
x = 93
.89($26,500)=$23,585. we are using .89 because that is what 1-.11 equals.
The answer would be 900,000