Four children made the following statements.
Hazel : Sebastian is 2 kg heavier than Ellie.
Ellie : Our masses are in consecutive order.
Josiah : The average of Hazel's mass and my mass is 36 kg.
Sebastian : I am the heaviest.

What is the total mass of Josiah, Sebastian and Hazel ?
Order of the mass of 4 children:
_____ , Ellie, _____ , Sebastian (Heaviest)

Total mass of Josiah and Hazel
= 2 x 36
= 72 kg

For Josiah and Hazel,
Mass of the lighter one = 1 u
Mass of the heavier one = 1 u + 2

Total mass of Josiah and Hazel
= 1 u + 1 u + 2
= 2 u + 2

2 u + 2 = 72
2 u = 72 - 2
2 u = 70

1 u = 70 ÷ 2 = 35

The mass of the four children in consecutive order is 35, 36, 37 and 38.

Total mass of Josiah, Sebastian and Hazel
= 35 + 37 + 38
= 110

Answer(s): 110 kg