In a 2 digit number, the units place digit is x. If the sum of digits be 9, then the number is (10x - 9). State whether the statement is true or false.
Solution:
Given, the unit’s place in a 2 digit number is x.
If the sum of digits be 9, then the number is (10x - 9).
We have to determine if the given statement is true or false.
Given, unit’s digit = x
Sum of digits = 9
Sum of digits = ten’s digit + unit’s digit
9 = ten’s digit + x
Ten’s digit = 9 - x
Number = 10(9 - x) + x
= 90 - 10x + x
= 90 - 9x
Therefore, the number is 90 - 9x
✦ Try This: In a 2 digit number, the units place digit is y. If the sum of digits be 8, then the number is (80 - 8x). State whether the statement is true or false.
☛ Also Check: NCERT Solutions for Class 8 Maths Chapter 2
NCERT Exemplar Class 8 Maths Chapter 4 Problem 35
In a 2 digit number, the units place digit is x. If the sum of digits be 9, then the number is (10x - 9). State whether the statement is true or false.
Summary:
The given statement, ”In a 2 digit number, the units place digit is x. If the sum of digits be 9, then the number is (10x - 9)” is false.
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