text: # Question
  
  Mr Wang sold 4 times as many ipads as laptops and the total collected is \$8400.
  
  each laptop cost \$325 more than an ipad.
  
  the amount collected for all the ipads sold was \$3480 more than the amount collected for all the laptops sold.
  
  how many laptop did he sell?
  
  laptops ——- 1u
  8400 – 3480 = 4920
  4920/2 = 2460 (laptops)
  8400 – 2460 = 5940 (4u of ipads)
  5940/4 = 1485 (1u of ipads)
  2460 – 1485 = 975
  975/325 = 3
  
  Ans : 3 laptops.
  
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  (\$8400 – \$3480)÷ 2 = \$2460 (all 1 unit of laptops)
  
  \$8400 – \$2460 = \$5940 (all 4 units of ipads)
  
  \$5940 ÷ 4 = \$1485 (1 unit of ipads)
  
  \$2460 – \$1485 = \$975 (difference in 1 unit of laptops and ipads)
  
  \$975 ÷ \$325 = 3 (1 unit)
  
  Laptop = 1 unit = 3
  
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