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Step-by-step explanation:

3)

No. of wooden boxes is less than 9

x< 9

No. of plastic boxes is not more than 10

y ≤ 10

Weight equation

Wood box 6 kg Plastic box 3 kg total 36 kg

which means that the weight that can be carried must be greater than or equal to the actual weight

6x + 3y ≥ 36

Volume equation

Wood box 0.25 m² Plastic box 0.5 m² total 3 m²

which means that the capacity of boxes must be greater than or equal to the capacity of actual load

0.25x + 0.5y ≥ 3

4) Let the no. of RM100 tickets be x and no. of RM150 tickets be y

no. of RM100 tickets is more than no. of RM150 tickets.

x > y

Total price exceeds 3000

100x + 150y > 3000

(a) the volume of the cone is 20/3 in3

hence, option a is correct.