Sands rebellion took place among the members of which native american tribe?

Actual measurement of bed is:

200 cm by 150 cm

Step-by-step explanation:

Elena’s bed measures 4 cm by 3 cm on the scale drawing.

The ratio of scale drawing to actual bed size is 1 to 50.

i.e. On scale drawing Length of bed=4 cm

Actual Length of bed= 4×50 cm

                                   = 200 cm

On scale drawing Width of bed=3 cm

Actual Width of bed= 3×50 cm

                                   = 150 cm

Hence, actual measurement of bed is:

200 cm by 150 cm