SOLUTION: Please help me with this math question on fraction.Thank you in advance. {{{3/20}}} of the bottled water in a supermarket were sold on Monday. 90 fewer bottles of water were sold

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Question 1187442: Please help me with this math question on fraction.Thank you in advance.
of the bottled water in a supermarket were sold on Monday.
90 fewer bottles of water were sold on Tuesday than on Monday. 70
fewer bottles of water were sold on Wednesday than on Tuesday. On
Thursday, 330 bottles of water were sold. The number of bottles of
water left in the supermarket was the number of bottles there was
at first. How many bottles of water were there in the supermarket at
first?
Found 2 solutions by MathLover1, MathTherapy:
Answer by MathLover1(20849)   (Show Source): You can put this solution on YOUR website!

let the number of the bottles of water be
were sold on Monday
fewer bottles of water were sold on Tuesday than on Monday:
were sold on Tuesday
fewer bottles of water were sold on Wednesday than on Tuesday,
=> were sold on Wednesday

On Thursday, bottles of water were sold.
The number of bottles of water left in the supermarket was the number of bottles there was at first.
left in the supermarket
add all and equal to
.......solve for



->bottles of water were there in the supermarket at
first

Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
Please help me with this math question on fraction.Thank you in advance.
of the bottled water in a supermarket were sold on Monday.
90 fewer bottles of water were sold on Tuesday than on Monday. 70
fewer bottles of water were sold on Wednesday than on Tuesday. On
Thursday, 330 bottles of water were sold. The number of bottles of
water left in the supermarket was the number of bottles there was
at first. How many bottles of water were there in the supermarket at
first?
Let original number of bottles be B
Amount sold on 

Total sold in 4 days: 

With  remaining, we can say that: 
20B - 9B - 20(80) = 10B ------ Multiplying by LCD, 20 
     11B - 20(80) = 10B
         - 20(80) = 10B - 11B
         - 20(80) = - B
Original number of bottles, or

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