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Answer

Curry Puff Sold (= total curry puff) |
Sandwich Sold | Sandwich left | Total Sandwich | |
Scenario 1 | 4u | 1u | 147 | 1u + 147 |
Scenario 2 | 1p | 2p | 21 | 2p + 21 |
From Curry Puff, we can see that
4u = 1p
From Sandiwch, we can see that
1u + 147 = 2p + 21
1u + 147 = 2(4u) + 21
1u + 147 = 8u + 21
7u = 126
1u = 18
(a) Total curry puffs -> 4u = 4 × 18 = 72
Total sandwiches -> 8u + 21 = 144 + 21 = 165
Mr Khoo paid for 4 sandwiches to get 5 sandwiches.
Every 5 sandwiches cost 4 × $1.20 = $4.80
165 ÷ 5 = 33
In total, Mr Khoo paid 33 × $4.80 = $158.40
ozora
Thanks.
Really lost in solving that