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a) Comparing the buddy and family combo, the family combo charges an extra $2 for 50g of popcorn.

For the buddy combo, since 150g costs $7.90, 50g cost $7.90 ÷ 3, which is between $2 to $3 (no need to work out).

Therefore, the family combo is more value for money.

b)

2 | 150, 200
5 | 75, 100
5 | 15, 20
– | 3, 4

LCM of 150 and 200 is 2 × 3 × 4 × 5 × 5 = 600

This means that if we buy 3 Family Combos and 4 Buddy Combos and we will end up with the same amount of popcorn – 600 grams.

3 Family Combos cost → $9.90 × 3
= $29.70

4 Buddy Combos cost → $7.90 × 4
= $31.60

For the same amount of popcorn (600 grams), I spend less if I go with the Family Combo. Hence, we can conclude that the Family Combo is better value for money.

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