Thermal physics help needed

can someone help me do both parts.
i used the specific heat capacity formula for part one but that didn't give me the right answer.

for part 2 i dont know how to start it

For part i you need to calculate the energy thermal required to increase the temperature of the ice from -15 degrees using Q=mc detla theta. But also it changes state so you have to add the energy required for ice to change into water which is Q=ml where l is the specific latent heat of fusion of ice

Is the answer 16.7 degrees

I think for part 2 you would use:

mcΔθ of the water = the energy value you just calculated

where Δθ would be (200 - θ)

where did you get the 200 from?
mark scheme says this :
dont understand the second part where they made the 2 equations equal.