Question

Solve all the questions

Answer 1

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$<b><i>$Soln 27) 4 × 4 + 4 × 2

= 16 + 8

= 24
............................................................
Soln 28) Let the supplementary angles be 4x and 5x respectively.

A/q,

4x + 5x = 180°

=> 9x = 180°

=> x = 180°/9

=> x = 20°

Required angles

4x = 4 × 20° = 80°

and 5x = 5 × 20° = 100°

•°• Difference = 100° - 80°

= 20°
...............................................................

Soln 29) y/7 = 45/5

=> 5 × y = 45 × 7

=> 5y = 45 × 7

=> y = (45 × 7)/5

=> y = 9 × 7

=> y = 63
.....................................................................

Soln 30) Let the length be 4x m and the breadth be 3x m.

Perimeter of the rectangle = 140 m

=> 2(l + b) = 140

=> 2(4x + 3x) = 140

=> 2 × 7x = 140

=> 14x = 140

=> x = 140/14

=> x = 10

•°• Length = 4x = 4 × 10 = 40 m

and breadth = 3x = 3 × 10 = 30 m

•°• Area of the rectangle

= length × breadth

= (40 × 30) m²

= 1200 m²
........................................................................

Soln 31) •°• The value of (y - x)

= 9 × ( 8 × 7 ) - ( 9 × 8 ) × 7

= ( 9 × 56 ) - ( 72 × 7 )

= 504 - 504

= 0

Answer 2

Answer:

Step-by-step explanations

[ (12÷3) ×4 +4 ×2]

[4×4+4×2]

16+8

=24

Let the angle of supplementary are4x and 5x

As we know that the sum of supplementary angle is 180

4x+5x=180

9x =180

X=20

First angle be=4×20

=80

Second angle be = 5×20

=100

Their difference angle be =first angle - second angle

100-80=

20

Y:7: : 45:5

By the cross multiple

5y=315

Y=315/5

Y=63