Explanation

Let the numbers be x and y, with x > y  

x + y = 52  

x - y = 8  

Add both equations:  

2x = 60 → x = 30  

Then y = 52 - 30 = 22  

Check: 30 + 22 = 52, 30 - 22 = 8  

Last verified on 12-05-2026

Explanation

Let the number be x.

Twice the number = 2x

Packets are 4 more than twice:

2x + 4 = 38

Solve:

2x = 38 − 4

2x = 34

x = 17

Last verified on 12-05-2026

Explanation

Given:  

Total fixed fee = Rs 750  

Total for 30 cards = Rs 2250  

Processing cost for 30 cards = 2250 - 750 = Rs 1500  

Processing amount for one card = 1500 ÷ 30 = Rs 50

Last verified on 12-05-2026

Explanation

Father = F, Son = S

Given:

F + S = 72 …(1)

Six years ago:

F − 6 = 2(S − 6) …(2)

Solve (2):

F − 6 = 2S − 12

F = 2S − 6 …(3)

Put in (1):

(2S − 6) + S = 72

3S − 6 = 72

3S = 78

S = 26

Son’s present age = 26

Son’s age 6 years ago = 26 − 6 = 20 years

Last verified on 10-05-2026

Explanation

A’s 1 day work = 1/12

B’s 1 day work = 1/18

Combined work = 1/12 + 1/18

= (3 + 2) / 36 = 5/36

Time taken = 1 ÷ (5/36) = 36/5 = 7.2 days

Last verified on 10-05-2026