There are 386 apple seeds and 487 mango seeds. How many seeds are there in total?

The correct option is D 873
Number of apple seeds = 386
Number of mango seeds = 487
Total number of seeds $=386+487$
Using the HTO table for decomposition:


$700+160+13$
$=700+100+60+10+3$
$=800+70+3=873$

So, there are 873 seeds in total.