Isabella Will need 121 beads
If she want to make 6 necklaces, she will need 20 bead each. Currently she only have 85 beads collected. In order to get the answer you must multiply the the number beads she needs and then subtract the it by the beads she have currently to get the number of beads needed!
Equation set up/ worked out:
20 x 6 = 206
206 - 85
121 beads!
Hope this is some of good use!