Question

1. Find the solution of 3x-4 = 12.

2. Solve: 5x-9 = 8

3. What should be subtracted from thrice the rational number -8/3 to get 5/2?

4. The sum of three consecutive multiples of 7 is 63. Find these multiples.

5. Solve :
3x/4 – 7/4 = 5x + 12

6. Perimeter of a rectangle is 13cm. if its width is 11/4 cm, find its length.

7. The present of Sita’s father is three times the present age of Sita. After six years sum of their ages will be 69 years. Find their present ages.

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Answer 1

Answer:

1)3x=16

x=16/3

2)5x=17

x=17/5

3)

Answer 2

Answer:

1)=3x-4=12

=3x=12+4

=3x=16

x= 16/3

2)5x-9=8

= 5x=8+9

= 5x= 17

=x= 17/5

4) Let the three multiples be 7x,7x+7 and 7x+14.

According to the question,

7x+7x+7+7x+14=63

21x+21=63

21x=63−21

x=

21

42

x=2

So,

7x=14

7x+7=21

7x+14=28

Hence, this is the answer.

Step-by-step explanation:

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