Question

Two types of boxes A,B are to be placed in truck having capacity pf 10 tons. When 150 boxes of type A and 100 boxes of type B are loaded in truck , it weight 10 tons . But when 260 boxes of type A are loaded in the truck, it can still accommodate 40 boxes of type B , so that it fully loaded . Find the weight of each type box.

Answer 1

Let the weight of box 'a' = x kg
And the weight of box 'b' = y kg

A/C to question,
150 boxes of type 'a' and 100 boxes of type 'b' are loaded in the truck and it weighs 10tons.
∴ 150x + 100y = 10 × 1000 [ ∵1 tone = 1000 Kg ]
⇒150x + 100y = 10000
⇒3x + 2y = 200 -------(1)

Again, A/C to question, 260 boxes of type 'a' and 40 boxes of type 'b' are loaded and it weighs completely 10tons.
∴ 260x + 40y = 10000
⇒13x + 2y = 500 --------(2)

Solve equations (1) and (2),
Subtracting equation (1) from equation (2)
(13x + 2y) - (3x + 2y) = 500 - 200
⇒10x = 300
⇒x = 30 , put it in equation (1)
2y = 200 - 3 × 30 = 200 - 90 = 110
⇒y = 55

Hence , weight of box 'a' = 30 Kg
weight of box 'b' = 55Kg

this is your answer..