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2×lenght /2×width,and do a cross multiplication ghing

C. 4.86

Step-by-step explanation:

Given :  The two rectangles below have the same height-to-width ratio.

Since , width  of blue rectangle =  34 units

Height of blue rectangle = 21 units

and  width of red rectangle =  w units

Height of red rectangle = 3 units

Then,  

i.e.

Hence, The value of w= 4.86