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## Question

primary 6 | Maths
| Ratio

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Actually not ratio but a random question. Like to horoscope booklets with questions that doesn't mks my sense. Pls help. I still got more questions to ask cause Idk. Help plss. Thanks in advance

Since the average she paid was only 78 cents per kg,

$0.78 x 2 = $1.56

$1.80 - $1.56 = $0.24

We can see this as $0.24 was transferred from the cost of sugar bought from shop A to the cost of sugar from shop B,to make the cost 'go up' from 70 cents to 78 cents per kg.

$0.78 - $0.70 = $0.08

$0.24 ÷ $0.08 = 3

So 3 kg of sugar was bought from shop B.

(Check :

Actual cost of sugar from shop B

= 3kg x $0.70per kg

= $2.10

Total cost of sugar from both shops

= $2.10 + $1.80

= $3.90

Average cost of sugar = $3.90 ÷ (2kg +3kg)

= $3.90 ÷ 5kg

= $0.78 per kg

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