A16 inch piece of string is 40.64 centimeters long to the nearest .01 a centimeter how long will a 42 inch piece of ribbon be?

X= centimeters in 42 inches

Compare the two sets of measurements; set up a ratio. Be sure inches are on top on both sides or on bottom on both sides. We cannot have inches on top on one side and on the bottom on the other. Same with centimeters.

16 inches/40.64cm= 42 inches/x cm
cross multiply

(16*x)= (40.64*42)

16x= 1706.88
divide both sides by 16

x= 106.68 cm

ANSWER: There are 106.68 cm in 42 inches.

Hope this helps! :)

No solution : there is no number of boxes that she bought