Evaluate the expression (6a)(2b) if a=2 and b=-1
1 answer:
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Answer:
8542
Statement
1.It is a four digit number
2.The tens are double the ones
3.The thousands are double the tens
4.The sum of the digits is nineteen
Step-by-step explanation:
It is a four digit number
lets take 4 digit number-ABCD
The tens are double the ones
-----------------------------1
The thousands are double the tens
-------------------------------2
According to equation 1 and 2
If we take
Possible number
OR
The sum of the digits is nineteen
I use hit and trial method
- If I take B is maximum
- If, i try to find value of B
---------------------3
So the unknown number is- 8542