For the average price 2⅔ lb. = 12/6 = 4/8¼ per lb.
Example 34.—Find in Scotch system the resultant and average counts of 36/36 Scotch with 2/40's cotton.
Bringing the cotton to Scotch counts—
| 20 × 840 | |
| = 84 cut, | |
| 200 |
by the rule—
| 84 × 18 | |
| = 14·82 counts, or × 2 = 29·6 average counts. | |
| 84 + 18 |
This rule can be applied twice in succession to find the counts of a three-fold yarn.
Example 35.—Find the counts of 80's, 40's and 20's folded together and give the average counts if they are used separately in a garment, one thread of each.
Taking 80's and 40's the resultant counts of these two is secured by the usual method—
| 80 × 40 | 80 × 40 | 80 | |||
| = | = | or 26⅔ counts. | |||
| 80 + 40 | 120 | 3 |