39 is the number shown by the blocks.
How to count?
When we are counting the blocks or anything we add 1 to our tally whenever the object we want to count is seen.
The solution to the problem
There are 2 blocks of ten, hence the number represented by these is 2*10 which is equal to 20.
There are 19 blocks of one, hence the number represented by these blocks is 19.
Hence the total number represented by is 20+19 = 39.
The number represented by the blocks is 39.
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