The correct option is A 3
Given, the total number of toys bought =8
Number of toys bought by elder sister =5
Let the number of toys bought by younger sister be x
⇒Number of toys bought by elder sister + Number of toys bought by younger sister = Total number of toys bought
⇒5+x=8
Subtract 5 from both the sides
⇒5+x−5=8−5
⇒x=3
Hence, the number of toys bought by younger sister is x=3