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The work function(w) of a metal X equals to 10-9.calculate the number( N)of photons of light of wavelength 26.52nm,whose total energy equals W

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Here you haven't specified that work function of metal is in joule or ev. So to solve it we are giving you the direction:

Calculate the energy of photon E = hc/λ 
where h (planks constant) = 6.63 x 10-34
c = 3x 108 m/s
λ = wavelength in metre of photon = 26.52 x 10-9 m

Now divide the work function (in joule)  by the energy of photon you will get the no. of photon.

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