Answer:
The first digit = m = 3
The last digit = n = 2
Step-by-step explanation:
We are told in the question that
Brryn's grand pa gave her a store receipt that listed 72 identical items, each the same price, for a total cost of $ * 67.9*
The first step we have to take is to multiples of 72
One of them is 8 and 9
Where,
9 × 8 = 72
Let us represent:
the first digit covered by m
the last digit covered by n
Second step
We find the last covered digit
For a number to be divided by 8, one of the important characteristics of the number is that is one of the multiples of 8
From price:
The last 3 digits =
79* =
We create number in multiples of 8 that can give us 7.9*
7.9* = 7.20 + 0.64+ 0.08
7.9* = 7.92
Hence, the last digit is 2
Third step
We find the first covered digit.
For a number to be divisible by 9, one of its important characteristics as well is that is it a multiple of 9
The first digit = m is determined as:
= m + 6 + 7 + 9 + 2
= m + 24
= m + 24
The multiple of 9 nearest to 24 is 27
Hence,
27 = m + 24
m = 27 - 24
m = 3
Therefore,
The first covered digit = m = 3
The last covered digit = n = 2
