Question

Helen has some pens and some square tiles .Each pen is 130mm longet . The sides of each tile are 13mm long . Helen lays ten pens end to end to make a straight line . She makes a line of tiles which is the same length as the line of pens . How many tiles does she use?

Answer 1

100

Explanation:

The total length of ten pens laid end-to-end is

10 pens × 130 mm/1 pen = 1300 mm

The number of tiles needed to stretch the same length is

1300 mm × 1 tile/13 mm = 100 tiles

Helen uses 100 tiles.