The correct option is C 50
The lengths of the toy cars are given in the cm.
For a miniature toy car:
Length = 1 cm
1 cm = 10 mm
∴ Length of miniature car = 10 mm
For a jumbo toy car:
Length = 12 cm
∴ Length of jumbo car = 12 × 10 = 120 mm
For a big toy car:
Length = 5 cm
∴ Length of big car = 5 × 10 = 50 mm
So, value of A = 50 mm