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ATQ,
168 ÷ 12 × 5 + 190 – 20% of 450
= 168 ÷ 12 × 5 + 190 – (1/5) of 450
= 168 ÷ 12 × 5 + 190 – 90
= 14 × 5 + 190 – 90
= 70 + 190 – 90
= 260 – 90
= 170
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