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4/5 of a certain number is 64. Half of that number is:
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14 Jun 2022, 05:03
14 Jun 2022, 05:03
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4/5 of a certain number is 64. Half of that number is:
(A) 16
(B) 32
(C) 40
(D) 80
(E) 100
(A) 16
(B) 32
(C) 40
(D) 80
(E) 100
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Joined: 10 Apr 2015
Posts: 6218
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Re: 4/5 of a certain number is 64. Half of that number is:
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14 Jun 2022, 05:07
14 Jun 2022, 05:07
1
Carcass wrote:
4/5 of a certain number is 64. Half of that number is:
(A) 16
(B) 32
(C) 40
(D) 80
(E) 100
(A) 16
(B) 32
(C) 40
(D) 80
(E) 100
4/5 of a certain number is 64
Let x = the number
So we can write: (4/5)x = 64
To isolate x, we can multiply both sides of the equation by 5/4 to get: (5/4)(4/5)x = (5/4)64
Simplify: x = 80
Half of that number is:
So we want to find half of 80, which is 40
Answer: C
gmatclubot
Re: 4/5 of a certain number is 64. Half of that number is: [#permalink]
14 Jun 2022, 05:07
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