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CaHeK987 [17]
3 years ago
12

A boy is twice as tall as his little sister and he is 30 cm shorter than his father. The

Mathematics
2 answers:
Alex777 [14]3 years ago
6 0

Answer:2h= boy

H=girl

2h-30=father

2h+h+2h-30=3.8m.....this is the equation

5h-30=3.8m

5h=3.8m-0.30m

5h=3.5m

Divide both sides by 5

H=0.7m

Step-by-step explanation:

Svetlanka [38]3 years ago
5 0

Boy = x

His Sister = y

Father = z

x = 2*y  

y = x/2

x = z-30 or z = x+30

3.8 m = 380 cm

x+y+z = 380

x + x/2 + x+30 = 380

multiply by 2

2x +x + 2x +60 = 760

5x = 700

x = 140 cm

y = x/2

 = 140 /2 = 70 cm

z = x+30

 = 140 + 30 = 170 cm

There  

x (Boy)             = 140 cm

y (His Sister)  = 70 cm

z (Father)        = 170 cm

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