Question

the total heigh of bill mary and rob is 180 cm bob is twice as tall as bill and mary is 28 cm taller than bill how tall is rob

Answer 1

Answer:

Rob is 76 cm tall.

Step-by-step explanation:

Let b = height of bill.

Let m = height of Mary.

Let r = height of Rob.

"the total heigh of bill mary and rob is 180 cm"

b + m + r = 180         Equation 1

"bob* is twice as tall as bill"

*I think you meant Rob is twice as tall as Bill.

r = 2b

"mary is 28 cm taller than bill"

m = b + 28

Substitue r = 2b and m = b + 28 into Equation 1.

b + b + 28 + 2b = 180

4b + 28 = 180

4b = 152

b = 38

r = 2b

r = 2(38) = 76

Rob is 76 cm tall.

Answer 2

Rob height is 76cm.

Given that,

• Total height of Bill, Mary and Rob is 180cm.
• Rob is twice tall as Bill.
• Mary is 28cm taller than Bill.
• We need to find the height of Rob.

According to the given data, computation of the data are as follows,

Let Bill height be X, then Rob height is 2X and Mary height is X + 28.

So, X + 2X + X + 28 = 180cm

4X = 180 - 28

X = 152 $\div$ 4

X = 38

Hence, Bill height = X = 38cm

Rob height = 2X = 76cm

Mary height = X + 28 = 66cm

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