Let's re-write this "MORE THAN" sentence as a "LESS THAN" sentence: The number of women is 850 LESS THAN that of men on a beach.
Now we see that to find the number of women, we subtract 850 1460 <--number of men -850 <--subtract 850 ---- 610 <--number of women
1460 <--number of men +610 <--number of women ---- 2070 <--number of people Edwin