The number is 25.
Given:
David adds 7 to a number and then divides it by 8 to get an answer of 4.
To Find:
The original number.
Solution:
To find the number we will follow the following steps:
Let the number be X.
On adding 7 n number X result will be X + 7
Now,
Dividing the X + 7 by 8 David gets 4.
So,
(X + 7 )/8 = 4
X + 7 = 8 × 4
X + 7 = 32
X = 32 - 7
X = 25
Henceforth, The number is 25.