Question

please help me find out the answer​

Answer 1

Answer:

9. 10 cm, 10 cm, 5 cm.

10. 16

11. 16

Step-by-step explanation:

9. Let's consider the third side which is not equal as x.

So, the two equal sides will 2x and 2x.

Perimeter = 25 cm.

As we know, perimeter = addition of three sides.

2x + 2x + x = 25 cm

5x = 25 cm

x = 25 ÷ 5 = 5 cm.

We had third side as x.

So, third side = x = 5 cm.

Two equal sides = 2x and 2x = 10 cm and 10 cm.

Therefore, the three sides are 10 cm, 10 cm and 5cm.

10. Let's consider Payal's marks as x.

Princi = 12

Akshi = 20.

Total average of all three = 16.

Average = ( sum of all the numbers ) ÷ total numbers

16 = ( 12 + 20 + x ) ÷ 3

16 = ( 32 + x ) ÷ 3

16 × 3 = 32 + x

48 = 32 + x

x = 48 - 32

x = 16.

Therefore, Payal's marks = x = 16.

11. Let's consider the number of notebooks with him as x.

Thrice the number of notebooks = thrice of x = 3x.

54 - 3x = 16

54 - 16 = 3x

48 = 3x

x = 48 ÷ 3 = 16.

Therefore, total number of notebooks with him will be 16.

Hope all these explanations help.

Answer 2

Step-by-step explanation:

9.

let the third side be x

the other two sides = 2x

x + 2x + 2x = 25cm

5x = 25cm

x = 25/5 cm

x = 5cm

the sides of the triangle are = 5 , 2(5), and 2(5)

= 5cm , 10cm and 10cm

10. Pinci score = 12

Akshi score = 20

Payal score = ?

(Pinci score + Akshi score + Payal score)/3 = 16

(12 + 20 + Payal score) = 16×3

(12 + 20 + Payal score) = 48

32 + Payal score = 48

Payal score = 48 - 32

Payal score = 16

11. Let the number of notebooks be x

54 - 3x = 6

- 3x = 6 - 54

- 3x = - 48

x = (-48)/(-3)

x = 16

hence, the number of notebooks amit has = 16