14. Add: 3a – 4b + 4c, 2a + 3b – 4c, a – 6b + c.
15. Subtract: 2a – 5b + 2c from 3a – 4c – c.
16. Factorize: 81x2 – 49y2
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17. Solve: 8x + 3 = 27 + 2x.
18. Reenu types 540 words during half an hour. How many words she type in 8 minutes?
19. 12 men can dig a pond in 8 days. How many men can dig it in 6 days?
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