base 10 blocks I have four base ten blocks Some are rods and

I have four base ten blocks. Some are rods and some are units. Their value is less than 25. Who am I? __________

Solution

as given we need to find number of units and rods and their value must be less than 25

You have 4 base 10 blocks

The entire value of rods and units must be less than 25 and number of rods + number of units must be 4

we know that units have a value 1 and rods have value 10 as we are using base 10 blocks

we need to use rods and units such that 4 of them have a value less than 25

if we use 1 rod + 3 units total value is 10 + 3 = 13 < 25 but not more accurate

if we use 2 rods + 2 units total value is 20 + 2 = 22 < 25 accurate

if we use 3 rods + 2 units total value is 30 + 1 = 31 > 25 so we cannot use 3 rods as 3 rods = 30 > 25

so we can use 2 rods + 2units for precise result

Hence 2 rods and 2 units is the answer to the puzzle