Indu's pencil is 15 cm long.
Jyoti's pencil is 8 cm long.
Whose pencil is longer?
How much longer?

Length of Indu's pencil = 15 cm
Length of Jyoti's pencil = 8 cm
Clearly, 15 is more than 8.
Therefore, Indu's pencil is longer than Jyoti's pencil.



Thus, Indu's pencil is 7 cm longer than Jyoti's pencil.