Rewrite using standard notation: 354.2*10^-2
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Given :
Tammy saved nickels and pennies in a jar the ration of nickels to pennies was 2 : 5 .
To Find :
If there where 70 nickels in the jar how many coins are there in all.
Solution :
Let, number of pennies are x.
It is given that ratio of nickels to pennies is 2 : 5.
So, numbers of pennies are 175.
Therefore, total number of coins in the jar is, 175 + 70 = 245 coins.
As given,
Step 1: Pick any three-digit counting number
Lets pick the number 643
Step 2: Reverse the digits of the original number.
So, reverse becomes 346
Now, it says that the difference of these two numbers has a tens digit of 9.
Lets, check:
So, its true that the difference has a tens digit of 9.
Another example:
Lets take 449
So reverse is = 944
Difference =
Here also the tens digit is 9.
So, the condition applies to all 3 digit numbers.