Knowing that 1 yards its 36 inch first we have to multiply 3 times 36 to get much much wood Ms. Jones has.
36*3=108 inches
Finally we have to divide 108 : 18 3/8 to get the answer.
108: [tex]18 \frac{3}{8}=108: \frac{18*8+3}{8}=108: \frac{147}{8} [/tex]
When we want to subtract number by fraction we can multiply number by inverse of that fraction, so
[tex]108: \frac{147}{8}=108* \frac{8}{147} = \frac{108*8}{147}= \frac{864}{147}=5 \frac{129}{147} [/tex]
We have to round down the result, so the answer is 5.