Answer: It will take him 30 weeks.
Explanation:
500 g is equal to 0.5 kg.
He wants to lose 0.5 kg a week.
For this to happen we must subtract 105 - 90 = 15.
2 x 1/2 = 15 x 2= 30.
It will take him 30 weeks to lose weight.
You welcome hoped this helped! :)