Question 1012058
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R=Roberto's age in 1950; J=Juan's age in 1950
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R=4J
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R+5=3(J+5)
4J+5=3J+15
J=10
Juan was 10 in 1950.
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R=4J=4(10)=40
Robert was 40 in 1950
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40-10=30
ANSWER: Robert was 30 when Juan was born