The large boxes weigh 40 pounds each, and the small boxes weigh 15 pounds each. There are

Large

small

let x big box and y small boxs are there

x+y= 135 ; 40x+15y=3650

40x+15(135-x) = 3650 ; 40x - 15x = 3650-2025

25 x = 1625; x = 65 Box ; hence y = 135-65 =70

hence 65 big boxes and 70 small boxes are there in the truck

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