Simplify:
{(220 – 140) + [10 × 9 + ( – 2 × 5)]} – 100

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Solution

{(220 – 140) + [10 × 9 + (– 2 × 5)]} – 100
= {80 + [10 × 9 + (– 10)]} – 100
= {80 + [10 × 9 – 10]} – 100
= {80 + [90 – 10]} – 100
= {80 + 80} – 100
= 160 – 100
= 60

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