actual sperm size = 0.00000375m
actual egg size = 0.00085125m
egg size in picture = 0.03405m = 34mm
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Okay, so assuming you've measured the female gamete, and it is 32mm in diameter
you then want to know how big it actually is. because the image is 40x bigger, you divide 34mm by 40
34/40 = 0.8 = size of female gamete in real life
same for male. image is 3mm and 800x bigger.
3/800 = 0.00375
now, how many times bigger is female (0.85) compared to male (0.00375)?
0.00375 x ? = 0.8
0.85/0.00375 = 227
so the egg is 227x the size of the sperm