Question

A bucket of 20 litres is 35% full.How many litres of water must be put in some that it is 65% full?

Answer 1

Total capacity of bucket = 20L
Percentage full = 35%
Hence volume filled is 35% of 20L
that is 35/100*20=7L           
ATP 35% is equivalent to 7L
1% is equivalent to 7/35L
65% is equivalent to 7/35 * 65 =13L               
Bucket is already filled with 7L that is 35%To make an empty bucket of same capacity to be 65% filled
We need 13L so volume of water required to fill the bucket from 35% filled to 65% filled that is from 7L to 13L filled We need more (13-7)L = 6L

Answer 2

Quantity of the bucket = 20 liters

Bucket full of = 35 percent

= 35 percent of 20 liters

= 35/100*20

= 7 liters

Bucket to full = 65 percent of 20 liters

= 65/100*20

= 13 liters

More water must be put = (13-7) liters

= 5 liters

Hope that it helps for you