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 By: adilah9 (offline)  Saturday, February 04 2012 @ 10:23 PM CST (Read 873 times)

Salleh's money was 3 1/2 times his brother's money.
After his mother had given him \$30 and his brother \$90, Salleh then had twice as much money as his brother.
How much money had Salleh at first?

[In ratio]

Newbie

Registered: 09/19/11
Posts: 12

 By: awyw1201 (offline)  Sunday, February 05 2012 @ 06:21 AM CST
awyw1201

Salleh's money was 3 1/2 times his brother's money.
After his mother had given him \$30 and his brother \$90, Salleh then had twice as much money as his brother.
How much money had Salleh at first?

[In ratio]

use units and parts

Ratio at 1st----7u:2u
Ratio after---2p:1p

7u + 30 = 2p---(1)
2u + 90 = 1p---(2)

(2) x 2----4u + 180 = 2p----(3)

(1) - (3), we have 3u = 150
Thus, 1u = 50
7u= 350

Ans: \$350

Regular Member

Registered: 07/08/11
Posts: 87

 By: adilah9 (offline)  Sunday, February 05 2012 @ 06:27 AM CST

Quote by: awyw1201

Salleh's money was 3 1/2 times his brother's money.
After his mother had given him \$30 and his brother \$90, Salleh then had twice as much money as his brother.
How much money had Salleh at first?

[In ratio]

use units and parts

Ratio at 1st----7u:2u
Ratio after---2p:1p

7u + 30 = 2p---(1)
2u + 90 = 1p---(2)

(2) x 2----4u + 180 = 2p----(3)

(1) - (3), we have 3u = 150
Thus, 1u = 50
7u= 350

Ans: \$350

Thank you!

Newbie

Registered: 09/19/11
Posts: 12

 By: awyw1201 (offline)  Sunday, February 05 2012 @ 06:37 AM CST
awyw1201

You are most welcome:-)

Regular Member

Registered: 07/08/11
Posts: 87

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