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# What is the product of integers a, b, and c if 2^{a} * 3^{b} * 5^{c} =

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Joined: 19 Mar 2014
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What is the product of integers a, b, and c if 2^{a} * 3^{b} * 5^{c} = [#permalink]

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09 Jul 2017, 07:43
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What is the product of integers a, b, and c if $$2^{a} * 3^{b} * 5^{c} = 270,000,000$$

A. 141

B. 147

C. 162

D. 235

E. 270

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Posts: 5783
Re: What is the product of integers a, b, and c if 2^{a} * 3^{b} * 5^{c} = [#permalink]

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09 Jul 2017, 08:08
1
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Expert's post
ydmuley wrote:
What is the product of integers a, b, and c if $$2^{a} * 3^{b} * 5^{c} = 270,000,000$$

A. 141

B. 147

C. 162

D. 235

E. 270

270000000=$$3^3*10^7$$

So a=c=7 and b=3..
abc=7*7*3=147

B
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What is the product of integers a, b, and c if 2^{a} * 3^{b} * 5^{c} = [#permalink]

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09 Jul 2017, 08:30
2
KUDOS
ydmuley wrote:
What is the product of integers a, b, and c if $$2^{a} * 3^{b} * 5^{c} = 270,000,000$$

A. 141

B. 147

C. 162

D. 235

E. 270

$$2^{a} * 3^{b} * 5^{c} = 270,000,000$$, simplify RHS

$$2^{a} * 3^{b} * 5^{c} = 27 * 10^{7}$$, factor $$10^7$$

$$2^{a} * 3^{b} * 5^{c} = 3^{3}*2^{7}*5^{7}$$

Bases are now the same, so a = 7, b = 3, and c = 7. Product = 7*3*7 = 147.

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Re: What is the product of integers a, b, and c if 2^{a} * 3^{b} * 5^{c} = [#permalink]

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10 Nov 2017, 04:46
2
KUDOS
Expert's post
ydmuley wrote:
What is the product of integers a, b, and c if $$2^{a} * 3^{b} * 5^{c} = 270,000,000$$

A. 141

B. 147

C. 162

D. 235

E. 270

Responding to a pm:

Note that cyclicity has no role to play in this. For it to work in a question, we need to know the power of the term. Here there are too many variables. It is a simple question of prime factorisation.
This is the reason GMAT is tricky - it's not the concept per say which is hard to understand, it's more about WHICH concept will help solve the problem.
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Joined: 04 Mar 2011
Posts: 2442
Re: What is the product of integers a, b, and c if 2^{a} * 3^{b} * 5^{c} = [#permalink]

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14 Nov 2017, 07:06
1
KUDOS
Expert's post
ydmuley wrote:
What is the product of integers a, b, and c if $$2^{a} * 3^{b} * 5^{c} = 270,000,000$$

A. 141

B. 147

C. 162

D. 235

E. 270

Let’s break 270,000,000 into its prime factors.

270,000,000 = 27 x 10,000,000 = 3^3 x 10^7 = 2^7 x 3^3 x 5^7, so a x b x c = 7 x 3 x 7 = 147.

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Re: What is the product of integers a, b, and c if 2^{a} * 3^{b} * 5^{c} =   [#permalink] 14 Nov 2017, 07:06
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