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Re: QOTD # 2 If (1/2)*x years ago Adam was 12, and (1/2)*x
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12 Mar 2017, 20:56
12 Mar 2017, 20:56
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Carcass wrote:
If \(\frac{1}{2}\)x years ago Adam was 12, and \(\frac{1}{2}\)x years from now he will be 2x years old,how old will he be 3x years from now?
A 54
B 18
C 24
D 30
E It cannot be determined from the given information.
A 54
B 18
C 24
D 30
E It cannot be determined from the given information.
Practice Questions
Question: 9
Page: 343
Difficulty: medium
Question: 9
Page: 343
Difficulty: medium
Re: QOTD # 2 If (1/2)*x years ago Adam was 12, and (1/2)*x
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13 Mar 2017, 01:51
13 Mar 2017, 01:51
Expert Reply
Hi,
I didnt get why you repost the entire question above instead to reply to the same what is or not clear to you ??
I didnt get why you repost the entire question above instead to reply to the same what is or not clear to you ??
Re: QOTD # 2 If (1/2)*x years ago Adam was 12, and (1/2)*x
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14 Mar 2017, 15:27
14 Mar 2017, 15:27
2
Expert Reply
Let Adams current age be \(y\).
If \(\frac{1}{2}x\) years ago Adam was 12:
\(y -\frac{1}{2}x = 12\)
and \(\frac{1}{2}x\) years from now he will be 2x years old
\(y+ \frac{1}{2}x = 2x\)
Solve for \(x\) and \(y\)
x = 12 y= 18
how old will he be 3x years from now?
\(y + 3x = 18 + 3*12 = 54\)
Hence A is correct answer.
If \(\frac{1}{2}x\) years ago Adam was 12:
\(y -\frac{1}{2}x = 12\)
and \(\frac{1}{2}x\) years from now he will be 2x years old
\(y+ \frac{1}{2}x = 2x\)
Solve for \(x\) and \(y\)
x = 12 y= 18
how old will he be 3x years from now?
\(y + 3x = 18 + 3*12 = 54\)
Hence A is correct answer.
