Question

A subtrahend is the number being subtracted in a subtraction problem. Robert misread the digit 1 in the ones place of the subtrahend as 7 and the digit 7 in the tens place of the subtrahend as 1. The difference in the subtraction then became 222. What would be the actual difference if he had read the numbers correctly?

Answer 1

Let the number being subtracted from be x
the error
x - 17 = 222
x = 222 + 17
x = 239
The number being subtracted from is 239
The real equation (Actual difference)
x - 71
239 - 71
= 168