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This is a Common  Ratio problem. 

  R1      R2  CR  Each Product
Airplane 2u   2u  12 24u
Car 3u 3u 3u 8 24u
Trian   5u   5u      6 30u
Total     10u   78u

78u = 156

1u = 156 ÷ 78 = 2

a)

24u = 24 × 2 = $48

b)

10u = 10 × 2 = 20 toys

 

 

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