water

• step 1 - the first 5 numbers from the left are black and the rest are red, only the black digits are considered
• the number of cm increases by 1 after the red reaches 999
• there are 8 numbers in a water meter
• step 2 - subtract the previous reading from the present reading
• measured in cubic meters
• solve , given - previous : 4213 m3, present : 4290 m3

  how much water was consumed in one month

  simply subtract the previous from the present

  present - 4290 -

  previous - 4213 = 77 m3