question_answer

The given figure shows a pattern of several squares drawn consecutively. The perimeters of the squares in figure form an arithmetic progression. The length of the first square is x cm and the length of the other consecutive squares differ from each other by 1 cm. Given the sum of the perimeters of the first five squares is 160 cm, find the sum of the perimeters of the first 10 squares.

A)  280 cm                                

B)  240 cm

C)  420 cm                

D)         360 cm