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Mr Tan recently found a new job after upgrading his skills. When he received his first-month salary, he deposited half of the salary in the bank. He used 

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 of the remaining salary to buy a necklace for his wife, and then he bought his friends 15 dinner vouchers, worth $8 each. In the end, he had $720 left in his wallet. What was Mr Tan's first-month salary?

 Feb 11, 2020
 #1
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Call the  monthly  salary, S

 

Amount  left after  depositing  (1/2) of his salary in the bank  = (1/2)S

 

So

 

(1/3) *(1/2)S    -  15 * 8  = 720    simplify

 

(1/6)S  - 120  = 720      add 120  to both sides

 

(1/6)S=  840     multiply both sides by 6

 

S = $5040

 

 

cool cool cool

 Feb 11, 2020

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