Question

3.
One-fourth of a number added to two-seventh of it gives 135; find the number
4. Two-fifth of a number subtracted from three-fourth of it gives 56; find the number.
5. A number is increased by 12 and the new number obtained is multiplied by 5. If the result​

Answer 1

Answer:

3.

let the number is x

x/4+2x/7=135

7x+8x/28=135

15x=135×28

x=135×28/15=9×28=252

the number is 252

4.

3x/4-2x/5=56

15x-8x/20=56

7x=56×20

x=56×20/7=8×20=160

the number is 160

Answer 2

Step-by-step explanation:

3) 1/4 x + 2/7 x = 135

15 x = 135 x 28

x = 3780 / 15

x = 252 ans

4) 2/5 x - 3/4 x =56

8x - 15x = 56 x 20

-7x = 1120

x = - 1120 / 7

x = - 160

5) (x + 12 ) x 5 = ?

5x + 60 =?

5x = - 60

x = -12