Given a split of 5 old for 14 new ,multiply the old ( current ) price by five ,then divide the result by 14 ,e.g. 5 shares @ $10 = $50 ,divide by 14 to get $3.5714 adjusted price for new shares. Any odd amounts left over will be credited.

Before n shares at $x a share equals total investment.

After same total, different number of shares, solve for new cost per share.

Adjust what?