What should be added to 16 to get- 31

Two dozen sweets are divided between Rajneesh and Kumar, so that they get 25% and 75% respectively. Find the number of sweets for Kumar

Reciprocal of -7/9 is

Simplify :

1/10×1/10 = 

Mala and Latha each had a number of bangles. Mala said to Latha "If you give me 4  of your bangles, my number will be thrice yours". Laytha replied "If you give me 36, my number will be thrice yours". What is the total bangles together with them