Question

How much water in 'g' should be added in $200$g $120\%$ column to makes it $105\%$?

Answer 1

In 200 g water - 120%

then $\frac{120}{100}\times 200=240g$

to make 105% $\frac{105}{100}\times 200=210g$

How much water added $=240g-210g$

$=\left[30g\right]$