The Dog need to gain 6 pounds for net change of zero pounds.
We have Lucy's whose dog lost 6 pounds.
We have to find out how much weight does her dog need to gain in order to have a net change of 0 pounds.
If you have 'x' toffees and you lost 'y' toffees, then how many toffees you have to buy to recover the lost toffees?
Number of toffees left after loosing 'y' toffees = x - y
The number of toffees to buy = x - (x - y) = x - x + y = y
A/Q -
Let the Dog's initial weight be - W
After loosing 6 pounds, the weight will be - W - 6
For a net change of zero pounds, he needs to add = W - (W - 6) = W - W + 6 = 6 Pounds.
Hence, he need to gain 6 pounds for net change of zero pounds.
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