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The tens digit of positive integer A is 4. The tens digit of 2A is 9.

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The tens digit of positive integer A is 4. The tens digit of 2A is 9. [#permalink] New post   31 Oct 2023, 00:43
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The tens digit of positive integer A is 4. The tens digit of 2A is 9.

Quantity A
Quantity B
Unit digit of A
4



A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.



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Re: The tens digit of positive integer A is 4. The tens digit of 2A is 9. [#permalink] New post   08 Nov 2023, 13:05
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A is some digit with tens digit 4, and 2A has tens digit of 9.

The minimum value of A is 45 -> 45*2=90 which fits our conditions. In this case, the units digit of A is greater than 4.
What about the maximum? Well 50*2 is 100, so clearly the maximum of A is 49, in which 2A is 98.
So 45<=A<=49
In all cases, the units digit is greater than 4.

A.
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Re: The tens digit of positive integer A is 4. The tens digit of 2A is 9. [#permalink]
08 Nov 2023, 13:05
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