Question

use the ratio 20ft/1 ft = 8.5heads/x heads
to find the hand size of the new human

Answer 1

can you help me?

Answer 2

same type of problem
cross multiply

Answer 3

is but can you solve it

Answer 4

yes but i want you to be able to solve it
anytime you have 2 fractions equal to each other
multiply each numerator by the other denominator and set the 2 products equal to each other

Answer 5

Given A/B = C/x
A*x = B*C
x = (B*C)/A
in this case
A=20
B=1
C=8.5

Answer 6

20/1=8.5/1 x=0.425