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26 Mar 2019, 23:16
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C
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Difficulty:
25%
(medium)
Question Stats:
78% (02:06) correct
22%
(02:26)
wrong
based on 117
sessions
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Some boys and girls are having a car wash to raise money for a class trip to China. Initially 40% of the group are girls. Shortly thereafter two girls leave and two boys arrive, and then 30% of the group are girls. How many girls were initially in the group?
(A) 4
(B) 6
(C) 8
(D) 10
(E) 12
(A) 4
(B) 6
(C) 8
(D) 10
(E) 12
26 Mar 2019, 23:50
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Let total number of children in group be x
Number of girls=0.4x
No. Of girls after 2 girls left
0.4x-2=0.3x
X=20
No. Of girls initially in the group=0.4x=8
Posted from my mobile device
Number of girls=0.4x
No. Of girls after 2 girls left
0.4x-2=0.3x
X=20
No. Of girls initially in the group=0.4x=8
Posted from my mobile device
27 Mar 2019, 01:32
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Bunuel
Some boys and girls are having a car wash to raise money for a class trip to China. Initially 40% of the group are girls. Shortly thereafter two girls leave and two boys arrive, and then 30% of the group are girls. How many girls were initially in the group?
(A) 4
(B) 6
(C) 8
(D) 10
(E) 12
(A) 4
(B) 6
(C) 8
(D) 10
(E) 12
b+g=x
so
0.4x=girls
0.4x-2=0.3x
solve x= 20
so 0.4*20 ; 8
ImO C
