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 By: Strawberry (offline)  Saturday, February 04 2012 @ 02:00 PM CST (Read 1180 times)
Strawberry

In a school Art Club, the ratio of the number of boys to the number of girls was 3:2. After 2 boys and 3 girls joined the club, the ratio became 4:3. How many girls were there at first?

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Registered: 01/31/09
Posts: 83

 By: shanmugamshanthi (offline)  Saturday, February 04 2012 @ 06:54 PM CST
shanmugamshanthi

BOYS GIRLS
AT FIRST 3U 2U
JOINED +2 +3
IN END 4P 3P

MAKE THE PARTS EQUAL BOYS*3 AND GIRLS *4
9U 8U
+6 +12
12P 12P

9U+6=8U+12
9U-8U=12-6
1U=6
Girls=2U=2x6
=12

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Registered: 12/31/06
Posts: 5

 By: adilah9 (offline)  Saturday, February 04 2012 @ 10:37 PM CST

Quote by: shanmugamshanthi

BOYS GIRLS
AT FIRST 3U 2U
JOINED +2 +3
IN END 4P 3P

MAKE THE PARTS EQUAL BOYS*3 AND GIRLS *4
9U 8U
+6 +12
12P 12P

9U+6=8U+12
9U-8U=12-6
1U=6
Girls=2U=2x6
=12

Can I know why make the parts (boys and girls) equal?

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Registered: 09/19/11
Posts: 12

 By: Strawberry (offline)  Sunday, February 05 2012 @ 08:43 PM CST
Strawberry

thank you

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Registered: 01/31/09
Posts: 83

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