maths

Question 1

The greatest No. that can be sabtracted from 5634 so that the reminder may be divisible by 20, 28, 32, 35 is?

Answer 1

Ans: 5414 Take LCM of 20,28, 32,35 which is 1120, and subtract it from 5634,

Question 2

which of the following is a Prime Number 91, 57, 67, 87

Answer 2

67

Question 3

A’s work given, B’s work given, together how much work they can do

Answer 3

AXB/A+B

Uper Guna/niche Jodh

Question 4

Both A and B combine work given, any one’s individual work given, find others individual work?

Answer 4

AXB/A-B (Higher- Lower)

Uper Guna/ Niche ghatao (Higher-Lower)

Question 5

Time taken to complete a work by 3 men ABC :3 days, days taken by 2 men AB :6 days, how long C take to complete the work alone

Answer 5

AXB / A-B (Higher- Lower)

Uper Guna/ Niche ghatao (Higher-Lower)

Question 6

A, B, C do a work in 6,9,18 days, together how long will they take to complet the work

Answer 6

AxBxC / AxB + AxC+ BxC
6x9x18/6x9 +6x18+ 9x18
or take LCM of 6,9,18 i.e 36, per day work of ABC 6,4, 2 resp. Per day work of all three (ABC) is 12 units per day, 36/12 = 3