The line chart given below shows the number of girls in 7 schools.

What is the difference between number of girls in school G, H and I together and the number of girls in school J, K, L and M together

100

Number of girls in school G, H and I together = 700 + 1300 + 800 = 2800

Number of girls in school J, K, L and M together = 1100 + 900 + 500 + 400 = 2900

Required difference = 2900 - 2800 = 100