Question

what is BCD equivalent mean for?

Answer 1

BCD = binary coded decimal

Answer 2

If the number is 29 the binary equivalent can be written as
$$29_{10}=11101_2$$
But in BCD, you take 2 and 9 separately from 29 and convert them separately to binary
$$2_{10}=10_2 $$
$$9_{10}=1001_2$$

So eventually the BCD equivalent of 29 can be written as the combination of these together
$$\underbrace{10}_{(\mathbb{from} \; 2_{10})}\underbrace{1001}_{(\mathbb{from}\;9_{10})}=101001$$