who is correct arnie or bea Please explain Arnie 34 cm is 17

Solution

Arnie supposition

3.4 cm is 1.7 times longer than 2cm

1.7*2 => 3.4 cm

hence arnie is correct

Bea- 70% longer than 2 cm

2cm +70/100*2

=>2+0.7*2

=>2+1.4

=>3.4

hence both are correct