The cost of 5 exercise books and two pens is Rs 250 . If the cost of one exercise book is Rs 40 , find the cost of 6 pens.

Rs 150

Step-by-step explanation:

Solution:

Here, the cost of 1 exercise book = Rs 40

Therefore, the cost of 5 exercise books = 5 × 40 = Rs 250

The cost of ( 5 exercise books + 2 pens ) = Rs 250

or, Rs 200 + cost of 2 pens = Rs 250

or, cost of 2 pens = Rs 250 - Rs 200

= Rs 50

Therefore, cost of 1 pen = Rs 50 ÷ 2

= Rs 25

And , cost of 6 pens = 6 × Rs 25

= Rs 150

Hence, the required cost of 6 pens is Rs 150.

6 pens is 150

Step-by-step explanation:

Let b = cost of exercise book

p = cost of pen

5 books + 2 pens = 250

5b+2p = 250

We know the cost of one book is 40

b = 40

Substitute this into the first equation

5(40) + 2(p) = 250

Multiply

200 + 2p = 250

Subtract 200 from each side

2p = 250-200

2p = 50

Divide by 2

2p/2 = 50/2

p =25

Each pen is 25

We want the cost of 6 pens

6*25 = 150

37/3

step-by-step explanation:

step 1: simplify both sides of the equation.

7x+8(x+

1

4

)=3(6x−9)−8

7x+(8)(x)+(8)(

1

4

)=(3)(6x)+(3)(−9)+−8(distribute)

7x+8x+2=18x+−27+−8

(7x+8x)+(2)=(18x)+(−27+−8)(combine like terms)

15x+2=18x+−35

15x+2=18x−35

tep 2: subtract 18x from both sides.

15x+2−18x=18x−35−18x

−3x+2=−35

step 3: subtract 2 from both sides.

−3x+2−2=−35−2

−3x=−37

step 4: divide both sides by -3.

−3x

−3

=

−37

−3

x=

37

3

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3