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This lesson is for Mayur
Qn 11. One-half of a number is 12. Find the number.
Let the number be x
x/2 = 12
x = 24
The number is 24

Qn 12.Three-fifths of a number is 30. Find the number.
Let the number be x
3x/5 = 30
3x = 5*30 = 150
x = 150/3 = 50
The number is fifty

Qn 13.The sum of 42 and a number is 96. Find the number.

Let x be the number
42 + x = 96
-42 from both sides
x = 96 - 42 = 54
The number is 54

Qn 14. A number multiplied by 0.3 is 6. Find the number.

Let x be the number
0.3 x = 6
X = 6/0.3 = 60/3 = 20
The number is 20

Q 15. The perimeter of an equilateral triangle is 25.5 cm. How long is each side?

Equilateral triangle has three equal sides, let s be the side.
3s = 25.5 cm
s = 25.5/3 = 8.5 cm.
Length of a side of the equlateral triangle is 8.5 cm.

Solve and check

Q1. y/3 = 5

Q2. -x/7 = -480.2

Q3. 2.7f = -16.2

Q4. 810/d = 9

Q5. -15 = b-29

More questions & answers will be added in few hours' time.