Question

A bucket of 20 litres is 35% full.how many litres of water must be put into it so 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

vol. of bucket =20 liters

how much bucket is full=35/100*20=7 liters

how much we will put in it =65/100*2=13 liters

difference =13-7=6 liters

we will put 6 liters more water to fill it to 65%.