On january 12 1980 it was Saturday. The day of the week on january 12 1979 was:

Options

A. Saturday
B. friday
C. sunday
D. tuesday

Answer

To find the day of the week on January 12, 1979, given that January 12, 1980, was a Saturday, we can follow these steps:

### Step 1: Identify the day of the week for January 12, 1980
We know from the problem that January 12, 1980, was a Saturday.

### Step 2: Determine the year difference
We need to find the day of the week for January 12, 1979. The difference between the two dates is 1 year (1980 - 1979 = 1).

### Step 3: Check if 1979 was a leap year
Since we are moving from January 12, 1980, back to January 12, 1979, we need to check if 1979 was a leap year. A year is a leap year if:
- It is divisible by 4,
- It is not divisible by 100 unless it is also divisible by 400.

1979 is not divisible by 4, so it is not a leap year.

### Step 4: Calculate the odd days
Since 1979 is not a leap year, it has 365 days, which means it has 1 odd day (365 days = 52 weeks + 1 day).

### Step 5: Move back one odd day from Saturday
Now, since we are going back one year (which gives us one odd day), we will subtract one odd day from Saturday:
- Saturday - 1 day = Friday.

### Conclusion
Therefore, January 12, 1979, was a Friday.