Question

All answers in math and which book it is

Answer 1

Answer:

1. a) Let the number be x

Therefore, 3/4 × x = 21

x = 28

b) 4 × x = 28

x = 7

c) 5 + 3x = 7

3x = 7 - 5

x = 2/3

d) 5(x - 6) = 0

x - 6 = 0

x = 6

2. Let the two numbers be x, (x + 1)

According to the problem,

x + (x + 1) = 101

2x + 1 = 101

2x = 100

x = 50

Therefore, the two numbers are 50 and 51

3. Let Soni's age be x

(4/5)x + 8 = 32

(4/5)x = 24

x = 30

4. Let the number of toffees Reena have be x

Therefore, Neena has = 4x - 2 = 14

4x = 16

x = 4

5. Score of Rajesh be x

Therefore, Score of Raj = 3x

according to the problem,

3x + x = 100 + 11

x = 111/4

or, 27.75

Therefore, Rajesh got 27.75 and Raj got 83.25

6. Number of red balls = x

Number of blue balls = 4 + 4x = 24

4x = 20

x = 5

7. Number of Chocolates = 2

Price = Rs. 100 - Rs. 10 = Rs. 90

Price of each chocolate = Rs. (90/2) = 45

8. Let the breadth of a the rectangle be x

therefore, length = 3x + 6

Given, Perimeter = 100m

2(l + b) = 100

2( 3x + 6 + x ) = 100

2(4x + 6) = 100

8x + 12 = 100

8x = 88

x = 11

therefore, breadth = 11m

length = (3 × 11) + 6 = 33 + 6 = 39m

9. Age of Shreya's Mother = 40 years

Let, Shreya's age be x

therefore,

2x + 10 = 40

2x = 30

x = 15