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Sarah is twice as old as her youngest brother. If the difference betwe
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14 Jan 2022, 03:01
14 Jan 2022, 03:01
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Sarah is twice as old as her youngest brother. If the difference between their ages is 15 years. How old is her youngest brother?
A. 10
B. 15
C. 20
D. 25
E. 30
A. 10
B. 15
C. 20
D. 25
E. 30
Re: Sarah is twice as old as her youngest brother. If the difference betwe
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14 Jan 2022, 03:25
14 Jan 2022, 03:25
Let Sarah age = x,
Sarah's brother age = y.
Given,
x = 2y ( Sarah is twice as old as his brother )
x - y = 15 ( Difference between age is 15 )
Solving these we get,
y = 15.
The correct choice is B
Sarah's brother age = y.
Given,
x = 2y ( Sarah is twice as old as his brother )
x - y = 15 ( Difference between age is 15 )
Solving these we get,
y = 15.
The correct choice is B
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Re: Sarah is twice as old as her youngest brother. If the difference betwe
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14 Jan 2022, 08:04
14 Jan 2022, 08:04
1
Carcass wrote:
Sarah is twice as old as her youngest brother. If the difference between their ages is 15 years. How old is her youngest brother?
A. 10
B. 15
C. 20
D. 25
E. 30
A. 10
B. 15
C. 20
D. 25
E. 30
We can solve this question using one variable or two variables. Let's use one variable.
We want to find the age of the youngest brother.
So, let x = the age of the youngest brother
This means 2x = Sarah's age (since she is twice as old as her youngest brother)
The difference between their ages is 15 years
In other words: (Sarah's age) - (the youngest brother's age) = 15
Substitute to get: 2x - x = 15
Simplify: x = 15
So the youngest brother is 15 years old.
Answer: B
