9÷5=1.8

Question

This lesson says that 9÷5=1.4

Answer 1

9 / 5 = 1
9 % 5 = 4

In math, 9 / 5 would be 1.8
OR 1 remainder 4
% (modulus) takes the remainder left over after division

Answer 2

Basically it does:
x = 9.0
y = 5.0

puts "#{z = x/y}"
#result equals 1.8

Since it has not x.0 and y.0, the result from
Ruby computing is 1.

And the excersice says:

9 divided by 5 is 1 with a remainder of 4.
That means

how many times 5 could be in 9? | result 1 | and remains 4
how many times 5 could be in 4? | result 0 | and remains 4 plus .0
how many times 5x10-1 (that means 0.5) could be in 4.0? | result 0.8 | and remains 0