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# Between 1950 and 1960 the population of Country A increased by 3.5 mil

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Math Expert
Joined: 02 Sep 2009
Posts: 55638
Between 1950 and 1960 the population of Country A increased by 3.5 mil  [#permalink]

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08 Jan 2019, 01:20
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Difficulty:

25% (medium)

Question Stats:

70% (01:04) correct 30% (01:10) wrong based on 40 sessions

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Between 1950 and 1960 the population of Country A increased by 3.5 million people. If the amount of increase between 1960 and 1970 was 1.75 million more than the increase from 1950 to 1960, what was the total amount of increase in population in Country A between 1950 and 1970?

A. 1.75 million
B. 3.5 million
C. 5.25 million
D. 7 million
E. 8.75 million

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Joined: 04 Jan 2015
Posts: 2888
Re: Between 1950 and 1960 the population of Country A increased by 3.5 mil  [#permalink]

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08 Jan 2019, 05:48

Solution

Given:
• Between 1950 and 1960 the population of country A increased by 3.5 million people
• The amount of increase between 1960 and 1970 was 1.75 million more than the increase from 1950 to 1960

To find:
• The total amount of increase in population in Country A between 1950 and 1970

Approach and Working:
Let the population in 1950 = x million
• Population in 1960 = x + 3.5 million
• Population in 1970 = x + 3.5 + 3.5 + 1.75 = x + 8.75 million

Therefore, increase in population from 1950 to 1970 = x + 8.75 – x = 8.75 million

Hence, the correct answer is Option E

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Re: Between 1950 and 1960 the population of Country A increased by 3.5 mil  [#permalink]

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09 Jan 2019, 00:44
Bunuel wrote:
Between 1950 and 1960 the population of Country A increased by 3.5 million people. If the amount of increase between 1960 and 1970 was 1.75 million more than the increase from 1950 to 1960, what was the total amount of increase in population in Country A between 1950 and 1970?

A. 1.75 million
B. 3.5 million
C. 5.25 million
D. 7 million
E. 8.75 million

let population before 1950 = x
1950-1960= x+3.5
1960-1970=x+3.5+1.75 = x+5.25+3.5 ; x+8.75

increase x+8.75-x ; 8.75 IMO E
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Re: Between 1950 and 1960 the population of Country A increased by 3.5 mil  [#permalink]

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10 Jun 2019, 04:54
Bunuel wrote:
Between 1950 and 1960 the population of Country A increased by 3.5 million people. If the amount of increase between 1960 and 1970 was 1.75 million more than the increase from 1950 to 1960, what was the total amount of increase in population in Country A between 1950 and 1970?

A. 1.75 million
B. 3.5 million
C. 5.25 million
D. 7 million
E. 8.75 million

Between 1950 and 1960 = 3.5m
Between 1960 and 1970 = 3.5 + 1.75 = 5.25m
Between 1950 and 1970 = 3.5 + 5.25 = 8.75m

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Re: Between 1950 and 1960 the population of Country A increased by 3.5 mil   [#permalink] 10 Jun 2019, 04:54
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