2019 · Q103
The least integer when multiplied by 2940 becomes a perfect square is
general-mental-abilityquantitative-aptitude
- A10
- B15
- C20
- D35
Explanation
Factorising, 2940 = 2^2 x 3 x 5 x 7^2; to complete the perfect square the unpaired primes 3 and 5 must be supplied, i.e. multiply by 3 x 5 = 15. Hence B.