Question

Q.2 Solve the sums. [08]

17. The number of illiterate persons in a country decreased from 150 lakhs to 100 lakhs in 10 years. What is the percentage of decrease?

18. Convert each part of the ratio to percentage 2 : 3 : 5.

19. Add: ab – 4a, 4b – ab, 4a – 4b

20. If a = 2, b = (-2), find the value of a2 + ab + b2​

Answer 1

Answer:

a. idk

b.

Step-by-step explanation:

b. 2/10×100 = 20%

3/10× 100=30%

5/10× 100= 50%

c. ab- 4a + 4b - ab +4a - 4b

ab - ab = 0

20. 2(2) + 2( -2 ) + (-2) (2)

4-4-4 = -4