After Effects of the Cold War

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Maths Holiday’s Homework
Maths text book d1
Ex#7a-7h
Pg#140
Q1.find the solution of each of the following equations by observation: (a)3a-4=a
3a-4+4=a+4
3a-a=a-a+4

2a=4
a=2
(b)50-5a=10
50-50-5a=10-50
-5a=-40
a=8
(c)24 =3
a
24 x a=3xa
a
24=3a
a=8
(d)1 a -1 a=2
2 3
1 a – 1 a=2 x 3
2 3
1 a – 1a=6 x 2
2
1a-1a=12
a=12

Ex 7B
Pg#144
Q1.Solve the following equations:
(a)a+5=17
a+5-5=17-5
a=12
(b)4a=-20
4a=-20
4 4
a=-5
(c) k-1.6=-0.4
K-1.6+1.6=-0.4+1.6
K=1.2

Q2.solve the following equations:
(a)3x-2=4
3x-2+2=4+2
3x=6
3 x= 6
3 3
x=2
(b) 4+9x=22
4-4+9x=22-4
9x=18
9 x=18
9 9
x=3
(c)11-2k=17
11-11-2k=17-11
-2k=6
-2 k=6
-2 -2
K=-3
(d)3x-1.7=4.3
3x-1.7+1.7=4.3+1.7
3x=6
3 x=6
3 3
x=2

Q3.solve the following equation:
(a)3(x+3)=15
3x+9=15
3x+9-9=15-9
3x=6
3x=6
3 3
x=2
(b) 4(h-2)=28
4h-8=28
4h-8+8=28+8
4h=36
4 h=36
4 4
h=9
(c)3(5-4x)=21
15-12x=21
15-15-12x=21-15
-12x=21-15
-12x=6
-12x=6
-12 -12
x=-0.5/-1
2

Ex7C
Pg#147
Q1.Solve the following equation.
(a)3a=2a+4
3a-2a=2a-2a+4
a=4
(b)4x=15-x
4x+x=15-x+x
5x=15

5x=15
5 5
x=3
(c)6x+5=9x-19
6x+5-5=9x-19-5
6x=9x-24
6x-9x=9x-9x-24
-3x=-24
x=8

Q2.Solve the following equations:
(a)2(c-4)=3(c-2)
2c-8=3c-6
2c-8+8=3c-6+8
2c=3c+2
2c-3c=3c-3c+2
-c=2
C=-2
(b)2(3a-4)=5(a+6)
6a-8=5a+30
6a-8+8=5a+30+8
6a=5a+22
6a-5a=5a-5a+38
a=38
(c)9(2x+7)=11(x+14)
18x+63=11+154
18x+63-63=11x+154-63
18x=11x+91
18x-11x=11x-11x+91
7x=91
7x=91
7 7
x=13

Q3.Solve the following equations:
(a)a+3=4
3
a+3-3=4-3
3
a x3=1x3
3
a=3
(b)x -2=3
5
x -2+2=3+2
5
x=5
5
X x5=5x5
5
x=25
(c)4-2x=-2
3
4-4-2x=-2-4
3
-2x x3=-6x3
3
-2x=-18
-2 -2
x=9

Q4.Solve the following equations:

(a)x+x=12
5
x+x x5=12x5
5
2x=60
2x=60
2 2
x=30
(b)2 =2(3x-7)
5
2=6x-14
5
2x5=6x-14x5
5
2=6x-70
6x=-2-70
6x=-72
6x=72
6 6
x=12

(c) 5-2x=2
7
5-2x x7=2x7
7
5-2x=14
5-5-2x=14-5
-2x=9
-2 -2
x=4.5/4 1
2

Ex7d
Pg#150
Take the value of π as 3 1 where
necessary. 7
Q1.If v=1 AH, find when a=43 and h=6.
3
v=1 x43x6
3
V= 1 x258
3
V=258
3
V=86
Q2.If F =9c+32, find F when c=30.
5
F=9 x 30 +32
5
F= 270 +32
5
F=54+32
F=86
Q3.If K=x+y, find X when K=12 and
3
Y=4 .
12=x + 4
3
12 x 3=x + 4 x 3
3
36 - 4=x + 4 -4
X=32
Ex 7E
Pg#151
Q1.Using the letter suggested, construct a simple formula in each case: (a)The sum (S) of three numbers a,b,c.
S=a+b+c
(b)The product (P) of two numbers x and y.
P=X x y
P=xy
(c)The difference between the ages of two boys; one being A years old and the other E years old. D=a-e

Ex7F
Pg#153
Q1.How many grams are there in 5kg? How many grams are there in x kg? Grams in 5kg=5 x 1000gm
Grams in x kg=1 x 1000gm
X kg=1000gm

Q2.Four tennis balls have the mass of m kg.Find the mass of each ball. Mass of 4 tennis balls=m kg
Mass of each ball=1 m kg
4...
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