(i) Ratio of original and reduced weight of woman = \[7:5\]
Consider original weight = \[7x\]
Reduced weight = \[5x\]
Here original weight = \[91\] kg
So the reduced weight = \[~\left( 91\text{ }\times \text{ }5x \right)/\text{ }7x\text{ }=\text{ }65\text{ }kg\]
(ii) Amount collected for charity = Rs \[2100\]
Here the ratio between orphanage and a blind school = \[3:4\]
Sum of ratios = \[3+4=7\]
we know that
Orphanage schools share = \[2100\text{ }\times \text{ }3/7\text{ }=\text{ }Rs\text{ }900\]
Blind schools share = \[2100\text{ }\times \text{ }4/7\text{ }=\text{ }Rs\text{ }1200\]