Question

Mark spends one third of the day sleeping.He spends 8 hours at school and one sixth of his day at soccer practise.How much free time does Mark have?

Answer 1

1/3 of 24 = 8 h sleeping (1/3 . 24)
8 [h]                 at school
1/6 of 24 = 4 h practise. (1/6 . 24)

X + 8 [h] + 8 [h] + 4 [h] = 24 [h]
X = 24 [h] - 20 [h]
X= 4 [h]