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For what value of x is it true that 0.2x = 3.3 0.5y and 0.6y = 0.2
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29 Aug 2022, 04:12
29 Aug 2022, 04:12
Expert Reply
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Question Stats:
87% (01:57) correct
12% (02:59) wrong based on 8 sessions
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For what value of x is it true that 0.2x = 3.3 – 0.5y and 0.6y = 0.2x + 2.2?
A 0.4
B 0.5
C 4
D 5
E 20
A 0.4
B 0.5
C 4
D 5
E 20
Part of the project: GRE QCQ & PS 3 Questions Every One DAILY Challenge - (2022)
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GRE Math Essentials (2022)
GRE Geometry Formulas
GRE - Math Book
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GRE Math Essentials (2022)
GRE Geometry Formulas
GRE - Math Book
For what value of x is it true that 0.2x = 3.3 0.5y and 0.6y = 0.2
[#permalink]
09 Oct 2022, 11:52
09 Oct 2022, 11:52
Expert Reply
OE
Quote:
Explanation: These are two equations in two unknowns, conveniently with the same x-term in each. Solve the second equation for the x-term, set it equal to the first equation. This is easier on the eyes if you multiply everything through by 10 first: 33-5y = 6y-22, so 55 = 11y and 5 = y. Don’t pick answer choice D; the question asks about x. Plug the y back into either equation to find x = 4.
gmatclubot
For what value of x is it true that 0.2x = 3.3 0.5y and 0.6y = 0.2 [#permalink]
09 Oct 2022, 11:52
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