Four children made the following statements.
Evelyn : Natalie is 2 kg heavier than Ellie.
Ellie : Our masses are in consecutive order.
Josiah : The average of Evelyn's mass and my mass is 35 kg.
Natalie : I am the heaviest.

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

Total mass of Josiah and Evelyn
= 2 x 35
= 70 kg

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

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

2 u + 2 = 70
2 u = 70 - 2
2 u = 68

1 u = 68 ÷ 2 = 34

The mass of the four children in consecutive order is 34, 35, 36 and 37.

Total mass of Josiah, Natalie and Evelyn
= 34 + 36 + 37
= 107

Answer(s): 107 kg