Question

21 is divided into two parts such that 7 times the first part added to 5 times the second part make 145. The first part is : *​

Answer 1

Answer:

First part= x

Second part= (145-x)

7x+5(145-x)= (145-x)

7x+725-5x = 145-x

2x+725 = 145 -x

2x-x= 145-725

x = - 620

Answer 2

Answer:

20

Step-by-step explanation:

Let the first part =x

2nd part=21-x

ATQ

7X+5(21-X)=145

=7X + 105-5X=145

2X+105=145

2X=145-105

2X=40

X=

$\frac{40}{2} = 20$