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Joined: 20 Feb 2017
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The formula for spring factor in a shoe insole is w^2+x/3, where w is
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11 Feb 2021, 07:16
11 Feb 2021, 07:16
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The formula for spring factor in a shoe insole is \(\frac{w^2+x}{3}\), where w is the width of the insole in centimeters and x is the grade of rubber on a scale of 1 to 9. What is the maximum spring factor for an insole that is 3 centimeters wide?
A. 3
B. 4
C. 5
D. 6
E. 7
A. 3
B. 4
C. 5
D. 6
E. 7
Re: The formula for spring factor in a shoe insole is w^2+x/3, where w is
[#permalink]
11 Feb 2021, 08:57
11 Feb 2021, 08:57
1
Hi,
(w^2+x)/3
w is the width of the insole in centimeters --->3 centimeters
x is the grade of rubber on a scale of 1 to 9.
Substituting w=3
(3^2+x)/(3) =(9+x)/3
Now we need x to be a multiple of 3, because we need the sum of the numerator to be divisible by 3 and the greatest possible number is 9
(9+9)/3) =(18/3) =6
IMO D
Hope this helps
(w^2+x)/3
w is the width of the insole in centimeters --->3 centimeters
x is the grade of rubber on a scale of 1 to 9.
Substituting w=3
(3^2+x)/(3) =(9+x)/3
Now we need x to be a multiple of 3, because we need the sum of the numerator to be divisible by 3 and the greatest possible number is 9
(9+9)/3) =(18/3) =6
IMO D
Hope this helps
gmatclubot
Re: The formula for spring factor in a shoe insole is w^2+x/3, where w is [#permalink]
11 Feb 2021, 08:57
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