Question

A boy weighs 110 pounds, a second boy weighs 130 pounds. How much does the third boy
weigh if the average weight of the three boys is 120 pounds? *
f. 105
O 1.115
b. 120
O q. 125
O v. 130​

Answer 1

The third boy weighs 120 pounds.

Step-by-step explanation:

Let the third boy weighs x pounds.

Then the sum of the weights of the three boys

= 110 + 130 + x

= 240 + x

Then average weight

= $\dfrac{240+x}{3}$

According to the question,

$\dfrac{240+x}{3}=120$

⇒ 240 + x = 360

⇒ x = 120

Thus the third boy weighs 120 pounds.

#SPJ3

Answer 2

Answer:

Final Answer.

Step-by-step explanation:

Given,

weight of first boy = 110 pounds

weight of second boy = 130 pounds

Let the weight of the third boy be x.

Sum of weights of three boys is

Sum = 110 + 130 + x

       = 240 + x

Mentioned in the question,

average of the weights of the three boys is 120 pounds.

So, Average = $\frac{sum of the weights}{3}$

                     = $\frac{240 + x}{3}$

Therefore,

$\frac{240 + x}{3}$ = 120

⇒ 240 + x = 360

⇒ x = 360 - 240

⇒ x = 120

Weight of the third boy is 120 pounds.

Hence, the final answer is 120.

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