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422
Mathematics
ANSWERS 1. 2. 3. 4.
5. 6. 7. 8. 9. 10. 11.
12. 13.
119 28 3 m The man takes an empty vessel other than these. With the help of 3 litre Can he takes out 9 litres of milk from the 10 litre Can and pours it in the extra Can. So, 1 litre milk remains in the 10 litre Can. With the help of 7 litre Can he takes out 7 litres of milk from the extra Can, and pours it in the 10 litre Can. The 10 litre Can now has 1 + 7 = 8 litres of milk. With the help of 3 litre Can he takes out 3 litres milk from the 10 litre Can. The 10 litre Can now has 8 – 3= 5 litres of milk, which he gives to the customer. 14, 25, 36, 47, 58, 69 2 units 1:2 80 (i) No, all children would not get it. (ii) All would get it. 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12, 5, 14, 7. 12, 10, 8, 6, 4, 2, 0, 12, 10, 8, 6, 4. Fill the 9 litre Can. Remove 5 litres from it using the 5 litre Can. Empty the 5 litre Can. Pour four litres remaining in the 9 litre Can to the 5 litre Can. Fill the 9 litre Can again. Fill the remaining 5 litre Can from the water in it. This leaves 8 litres in the 9 litre Can. Empty the five litre Can. Fill it from the 9 litre Can. You now have 3 litres left in the 9 litre Can. Height = 9m 36
Brain - Teasers
14. 90 minutes 15. Steps with one pair of foot marks - 2, 3, 9, 10 Steps with no foot marks - 1, 5, 7, 11 16. 52 17. 99 + 18. 19. 20. 21. 22. 23. 24. 25.
9 9
10 30 km 50 km Rs 7000 per month Rs 15,00,000 Index finger 106 mangoes 27
26. One arrangement could be 27. (a) 25 (b) 27 (c) 42 (d) 21 (e) 21 28. One such pair is 13 × 62 = 31 × 26
423
Mathematics
ANSWERS 1. 2. 3. 4.
5. 6. 7. 8. 9. 10. 11.
12. 13.
119 28 3 m The man takes an empty vessel other than these. With the help of 3 litre Can he takes out 9 litres of milk from the 10 litre Can and pours it in the extra Can. So, 1 litre milk remains in the 10 litre Can. With the help of 7 litre Can he takes out 7 litres of milk from the extra Can, and pours it in the 10 litre Can. The 10 litre Can now has 1 + 7 = 8 litres of milk. With the help of 3 litre Can he takes out 3 litres milk from the 10 litre Can. The 10 litre Can now has 8 – 3= 5 litres of milk, which he gives to the customer. 14, 25, 36, 47, 58, 69 2 units 1:2 80 (i) No, all children would not get it. (ii) All would get it. 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12, 5, 14, 7. 12, 10, 8, 6, 4, 2, 0, 12, 10, 8, 6, 4. Fill the 9 litre Can. Remove 5 litres from it using the 5 litre Can. Empty the 5 litre Can. Pour four litres remaining in the 9 litre Can to the 5 litre Can. Fill the 9 litre Can again. Fill the remaining 5 litre Can from the water in it. This leaves 8 litres in the 9 litre Can. Empty the five litre Can. Fill it from the 9 litre Can. You now have 3 litres left in the 9 litre Can. Height = 9m 36
Brain - Teasers
14. 90 minutes 15. Steps with one pair of foot marks - 2, 3, 9, 10 Steps with no foot marks - 1, 5, 7, 11 16. 52 17. 99 + 18. 19. 20. 21. 22. 23. 24. 25.
9 9
10 30 km 50 km Rs 7000 per month Rs 15,00,000 Index finger 106 mangoes 27
26. One arrangement could be 27. (a) 25 (b) 27 (c) 42 (d) 21 (e) 21 28. One such pair is 13 × 62 = 31 × 26
423
