Kilograms 7343

Max and Katy together weigh 75 kg. Katy and Tina are 71 kilograms. Max and Tina 80 kilograms. How many kilograms does each of the children weigh?

Correct answer:

k =  33
m =  42
t =  38

Step-by-step explanation:


m+k=75
k+t=71
m+t=80

k+m = 75
k+t = 71
m+t = 80

Row 2 - Row 1 → Row 2
k+m = 75
-m+t = -4
m+t = 80

Row 3 + Row 2 → Row 3
k+m = 75
-m+t = -4
2t = 76


t = 76/2 = 38
m = -4-t/-1 = -4-38/-1 = 42
k = 75-m = 75-42 = 33

k = 33
m = 42
t = 38

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