Answer:

given: 15 4/10 kls - father had bought

3 1/2 kls - each son has received

solution:

15 4/10 - (3 × 3 1/2) = 15 4/10 - (3 × 7/2)

= 15 4/10 - (21/2)

= 154/10 - 21/2

(find their LCD) = (154-105) / 10

= 49/10 or 4 9/10 kilos

Step-by-step explanation:

hope it helps.