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Algebra Level 1

2 x + 3 , 4 x 5 \large 2x + 3 , \quad 4x - 5 The above are 2 integers, the smaller of which is 67.
What is the larger of the 2 numbers?


The answer is 123.

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5 solutions

Yosua Putra
Dec 26, 2016

Relevant wiki: Setting Up Equations

We either have 2 x + 3 = 67 2x + 3 = 67 or 4 x 5 = 67 4x - 5 = 67 ,
which gives, x = 32 x = 32 or x = 18 x = 18 .

If x = 18 x = 18 , then 2 x + 3 = 39 2x + 3 = 39 and 4 x 5 = 67 4x - 5 = 67 , but this means that the other number is smaller than 67, so x = 18 x=18 is not a solution.

Thus, x x must be 32.
And so, 2 x + 3 = 67 2x + 3 = 67 and 4 x 5 = 123 4x - 5 = \boxed{123 } .

Keerthi Bychapur
Dec 28, 2016

First let 2x+3 =67 we get x=32 and then when we equate 4x-5=67 we get x=31/2 so 2x+3=67 is correct so according to the question 67 is the smaller number . When we equate x=32 in 4x-5 we get the value as 123 so 123 is the larger number

Anubhav Pal
Dec 28, 2016

given smaller no is 67 by seeing it's that the smaller is 2x+3 then 2x+3 =67 soving we get x +32 now put this x in 4x-5 then it's equal to 123.

Irina Stanciu
Dec 30, 2016

There are two possibilities: 4 x 5 = 67 4x-5=67 or 2 x + 3 = 67 2x+3=67 \; If 4 x 5 = 67 4x-5=67 => x=18 a n d and if 2 x + 3 = 67 2x+3=67 =>x=32. Hence 32 > 18 32>18 ... we will choose x = 32 x=32 so 4 32 5 = 128 5 = 123 4*32-5=128-5=123 . A n d t h e a n s w e r i s 123 And\;the\; answer\; is \;123

First, 2x + 3 = 67, second 4x - 5 = 67.
Then, it gives us x = 32 or x = 18
If x = 18, then 2x + 3 = 39 and 4x - 5 = 67. This is false, because the other number is smaller than 67.
Thus, x = 32 must be the solution.
Then check it one by one.
2 * 32 + 3 = 67 and
4 * 32 - 5 = 123
And the correct answer is 123.




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