Question

solve it.............

Answer 1

12pens=180
1pen=180/12=15

8ball pens=56
1 ball pen=56/8=7

required ratio
15: 7

Answer 2

Hey buddy, here is your answer.

For Q11:
part (a)
the ratio is 3:1

part (b)
the ratio is 16:15

part (c)
the ratio is 4:9

Now, moving on to Q12:

Cost of one pen is = 180/12
=Rs 15

Cost of one ball pen = 56/8
=Rs 7

So the ratio is 15:7

Hope it helps you.
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