The average weight of a class of N students is 47kg. If 8 students with average weight of 53kg leave the class and 3 new students with average weight 56kg join the class, the average weight of the class decreases by 0.6kg. What is the number of students in class now?​

Answers 1

Answer:

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Step-by-step explanation:

The average weight of a class of 33 students is 47 kg.

The average weight of the class increases by 2 kg when the weight of the teacher is included.

Calculation:

According to the question,

The average weight of a class of 33 students is 47 kg.

Total weight of a class of 33 students = 33 × 47 = 1551 kg.

Total weight of a class including teacher = 34 × 49 = 1666 kg.

Weight of teacher = (1666 – 1551) kg

⇒ Weight of teacher = 115 kg

∴ The weight of the teacher is 115 kg.

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find the point where the graph of the equation 2x+ 5y=14 cuts the x-axis and y-axis​

Step-by-step explanation:

The given linear equation is 2x−y=4

2x−y=4

Put y=0

⇒ 2x−0=4

⇒ 2x=4

∴ x=2

Substutute x=2 in equation,

⇒ 2(2)−y=4

⇒ 4−y=4

∴ y=0

⇒ (x,y)=(2,0)

⇒ The graph of the linear equation 2x−y=4 cuts x-axis at (2,0).

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Explanation:

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Answer:

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how to convert 30 cm into m

Answer:

1m=100cm1cm=1/100m

=30/100

= 0.3m

Answer: 0.3 m

Step-by-step explanation:

For to convert 30cm to m.

we know , 1m = 100cm, ....(1)

          and 1cm = 1/100m ....(2)

Now,    30cm = 30 * 1/100m        [from  (2) we take  1cm =1/100 ]

                        =30/100 m

                        = 0.3m

This is the required answer.

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