How many blocks are there?

The number of blocks has 9 in the ones place.

The number in the hundreds place is one more than the number in the tens place.

Those two numbers equal 11.

How many blocks are there?
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The number of blocks in the tens place we call A and the number in the hundreds place will be A+1. So A+A+1=11. 2A+1=11, so 2A=10 and A=5. Therefore the number of blocks is 659.
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