a) The chocolate is divided into 12 equal pieces.
Step 1: Since Raji got one-fourth of the whole chocolate, multiply 1/4by 12 to find the share of Raji.
1/4 X 12 = 12/4 = 3
Therefore, Raji got 3 pieces of the chocolate.
Step 2: Since Sugandha got one-third of the whole chocolate, multiply 1/3 by 12 to find the share of Sugandha.
1/3 X 12 = 12/4 = 4
Therefore, Sugandha got 4 pieces of the chocolate.
Step 3: Since Sheela got one-sixth of the whole chocolate, multiply 1/6 by 12 to find the share of Sheela.
1/6 X 12 = 12/6 = 2
Therefore, Sheela got 2 pieces of the chocolate.
Step 4: Since Manju ate the remaining part, add the shares of each of her friends and then subtract the result from 12 to find the share of Manju.
4 + 3 + 2 = 9 12 – 9 = 3 Therefore, Manju got 3 pieces of the chocolate.
b) Since Manju got 3 pieces out of 12 pieces of the chocolate, divide 3 by 12 to find the portion of the whole chocolate that Manju ate.
3/12 = 1/4
Therefore, Manju got one-fourth of the chocolate.