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Question

Evaluate 1510+20+40-5-80, it being given that 5=2.236 and 10=3.162.
Hint
1510+20+40-5-80=1510+25+210-5-45=15310-35=510-5


Solution

1510+20+40-5-80=1510+25+210-5-45=15310-35=510-5=510-5×10+510+5=510+5102-52=510+510-5=510+55=10+5=3.162+2.236     (given)=5.398

Hence, 1510+20+40-5-80 = 5.398 .

Mathematics
RS Aggarwal (2020, 2021)
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