What is the greatest number of theoretical cross-linkages possible by vulcanizing 100 g of polyisoprene chains?

(a) the number-average molecular weight.  22,500 * 0.04 + 37,500 * 0.07 + 52,500 * 0.16 + 67,500 * 0.26 + 82,500 * 0.24 + 97,500*0.12 + 112,500*0.08 + 127,500 * 0.03 = 73,800 
(b) the weight-average molecular weight.  22,500*0.01 + 37,500*0.04 + 52,500 * 0.11 + 67,500 * 0.24 + 82,500 * 0.27 + 97,500 * 0.16 + 112,500 * 0.12 + 127,500 * 0.05 = 72,000

It is true because i have took the test and it came out to be true

D.na is the answer hope this