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# For all real numbers x, the operation Δ is defined as xΔ = . If (bΔ)Δ

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For all real numbers x, the operation Δ is defined as xΔ = . If (bΔ)Δ [#permalink]

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10 Jun 2016, 03:28
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For all real numbers x, the operation Δ is defined as xΔ =x+$$\frac{x}{4}$$ . If (bΔ)Δ =$$\frac{25}{8}$$ , what is the value of b ?

(A) 1.5

(B) 2

(C) 2.5

(D) 3

(E)3.5
[Reveal] Spoiler: OA

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Md. Abdur Rakib

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Sentence Correction-Collection of Ron Purewal's "elliptical construction/analogies" for SC Challenges

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Re: For all real numbers x, the operation Δ is defined as xΔ = . If (bΔ)Δ [#permalink]

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10 Jun 2016, 03:41
AbdurRakib wrote:
For all real numbers x, the operation Δ is defined as xΔ =x+$$\frac{x}{4}$$ . If (bΔ)Δ =$$\frac{25}{8}$$ , what is the value of b ?

(A) 1.5

(B) 2

(C) 2.5

(D) 3

(E)3.5

xΔ =x+$$\frac{x}{4} = \frac{5x}{4}$$...
so $$(bΔ)Δ = \frac{5}{4}*\frac{5b}{4}$$=$$\frac{25}{8}$$.................$$\frac{25b}{16}= \frac{25}{8}$$........b=2
B
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Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

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Re: For all real numbers x, the operation Δ is defined as xΔ = . If (bΔ)Δ [#permalink]

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04 Oct 2017, 11:35
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Re: For all real numbers x, the operation Δ is defined as xΔ = . If (bΔ)Δ   [#permalink] 04 Oct 2017, 11:35
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