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Q.

Using properties of rational numbers, evaluate:  47×1-67

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a

449

b

57

c

121

d

527

answer is A.

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Detailed Solution

Given, 47×1-67=47×1+-67

=47×1+47×-67 

(Using distributivity of multiplication over addition)

=47-2449     (LCM of 7 and 49 is 49)

=28-2449 

=449

Therefore, 47×1-67=449.

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