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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.
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