Problems on Numbers - Aptitude Questions and Answers Part 5

21. Given 4500 * x = 3375
Find x.

a. 1/4
b. 2/5
c. 3/5
d. 3/4


22. 8597 - a = 7429 - 4358
Find the value of 'a'.

a. 5426
b. 5476
c. 5526
d. 5706


23. (1² + 2² + 3² + … + 20²) = ?

a. 330
b. 345
c. 365
d. 385


24. Which of the following is a prime number?

a. 33
b. 81
c. 93
d. 97


25. Find the value of: 217 * 217 + 183 * 183 = ?

a. 79698
b. 80578
c. 80698
d. 81268