16. Add : a + 2b – c, –a + 4b + 3c and 2a – 3b – 6c
17. Find least number of 5-digits divisible by 12, 18, 24 and 36.
18. The sum of three consecutive odd numbers is 93. Find numbers.
19. Find the 3rd proportional to the following numbers :
(a) 15, 45 (b) 6 , 24
20. Find the mean proportional between the following numbers :
(a) 4, 9 (b) 9, 81
21. Find the value of x in the following proportion :
(a) 7 : 15 :: x : 30 (b) 8 : 16 :: 25 : x
22. Find least number of 5-digit divisible by 15, 25 and 30.
23. Add :
a + 2b – c, –a + 4b + 3c and 2a – 3b – 6c
24. The ratio of income and expenditure are 5 : 3. If income is Rs. 50000, find savings.
25. Subtract the sum of –425 and –385 from the sum of –405 and 850.
25. The sum of three consecutive integers is 45. Find these numbers.
26. A number divided by 4 then increased by 6 gives 10. Find the number.
27. Solve for x :
28 = 4 + 3(x + 5)
Check your result.
28. Three times a number decreased by 6 gives 12. Find the number.
29. Solve for x :
4(x + 1) + 5 = 2x – 3
Check your result.
30. Write the following fractions in simplest form :
(i) 273
169
(ii) 273
289
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Answer:
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