Explanation

= 20 percent *820 

= ( 20:100)*820

= ( 20*820):100 

= 16400:100

= 164

20 percent of 820 is 164

Explanation

The calculation is done as follows:

12 ÷ 3 = 4
4 + 2 = 6

So, 12 ÷ 3 + 2 = 6.

Explanation

1/16 of 1028 = 1028 ÷ 16 = 64.25

1/4 of 236 = 236 ÷ 4 = 59

1/3 of 741 = 741 ÷ 3 = 247

So, 1/3 of 741 (247) is the greatest number.

Explanation

Explanation

 (10x+y)−(10y+x)=36

9(x−y)=36

x−y=4

Explanation

3 x 3 = 9

4 x 4 = 16

5 x 5 = 25

6 x 6 = 36

Explanation

Speed (v) of train = 60 km/hr. And it takes 9 seconds to cross a pole. Therefore, time (t) = 9 seconds. Now as we know 1 km = 1000 meter. And 1 hr. = 3600 sec. So 1(km/hr.) = (1000/3600) = (5/18) meter/seconds So 60 km/hr. = 60×(5/18)=503 m/sec. So the speed (v) of the train = 503 m/sec. Now as we know speed (v), distance (s) and time (t) is related as s=v×t Units. Now let the length of the train be l m. ⇒l=v×t Meters. Now substitute the values in above equation we have, ⇒l=503×9=150 Meters.           

Explanation

We can write:   8 ÷ 2/10 = 8 x 10/2 = 40

Explanation

400 x 15/100 =?

4 x 15 = 60

Explanation

Solve 7n + 12 = 4n + 27

= 7n - 4n + 12 - 27

= 3n + 12 

= 3n - 15 

15 = 3n

15/ 3 = n 

n =  5