Verified answer

Answer:

LENGTH OF MODEL SHIP= 21 M

Step-by-step explanation:

Mast of model ship = 9cm

Mast of actual ship = 15cm

Length of actual ship = 35m = 3500cm

Length of model ship = x

Using unitary method

Length. Mast

3500. 15

x. 9

We get,

3500 × 9 = 15x

x = 31500/15

x = 2100 cm

x = 21 m

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Answer:

21 is the correct answer