Explanation

He sells 40% of them, so he is left with 60% of x. According to the problem: 60% of x = 360 => (60/100) * x = 360 => 0.6x = 360 => x = 360 / 0.6 => x = 600

He sells 40% of them, so he is left with 60% of x.

According to the problem:

60% of x = 360  

=> (60/100) * x = 360  

=> 0.6x = 360  

=> x = 360 / 0.6  

=> x = 600

According to the problem:

60% of x = 360  

=> (60/100) * x = 360  

=> 0.6x = 360  

=> x = 360 / 0.6  

=> x = 600

Explanation

Cow 1 (4000 l) increases by 15%:  

15% of 4000 = 0.15 × 4000 = 600  

New amount = 4000 + 600 = 4600 l

Cow 2 (3100 l) increases by 10%:  

10% of 3100 = 0.10 × 3100 = 310  

New amount = 3100 + 310 = 3410 l

Total production in 2nd year = 4600 + 3410 = 8010 l

Explanation

Discount = 20% of 90,00,000

= 0.2 × 90,00,000

= 18,00,000

Discounted price = 90,00,000 - 18,00,000

= 72,00,000

Explanation

30% of 30 = 0.3 × 30 = 9

50% of 22 = 0.5 × 22 = 11

9 + 11 = 20

Explanation

Explanation

Explanation

Explanation

Explanation

Explanation

- Brightest 20% = 20 students, mean score = 80  

- Dullest 25% = 25 students, mean score = 31  

- Remaining 55% = 55 students, mean score = x (to find)  

- Overall mean = 52

Using weighted average:

(20 × 80) + (25 × 31) + (55 × x) = 100 × 52  

1600 + 775 + 55x = 5200  

55x = 5200 - 2375  

55x = 2825  

x = 2825 / 55  

x = 51.36 approx.