 Important for :
1
{( 39.99% of (2 / 5) + 60.05% o f (1 / 5) } × 103 + ? = 1
» Explain it
D
{( 39.99% of (2 / 5) + 60.05% o f (1 / 5) } × 103 + ? = 1

{( 40% of (2 / 5) + 60% of (1 / 5)} × 1000 + ? ≈ 1

? = 1 – (0.16 + 0.12) × 1000

? = 1 – 0.28 × 1000 = 1 – 280 = – 279

Hence, option D is correct.

2
12.992 + √?2 = 11.102 + 14.0092
» Explain it
D
12.992 + √?2 = 11.102 + 14.0092

132 + ? ≈ 112 + 142

? = (121 + 196) – 169

? = 148

Hence, option D is correct.

3
(22.99 + 17.01) ÷ 1.998 × 3.997 – 41.998 + 644.199 = ?
» Explain it
C
(22.99 + 17.01) ÷ 1.998 × 3.997 – 41.998 + 644.199 = ?

{(23 + 17) / 2} 4 – 42 + 644 ≈ ?

? = 20 × 4 – 42 + 644

? = 80 + 644 – 42 = 724 – 42 = 682

Hence, option C is correct.
4
(0.000729)1/6 of 302 ÷ 3 + 152 = ?
» Explain it
B
(0.000729)1/6 of 302 ÷ 3 + 152 = ?

? ≈ 0.3 × 900  ÷ 3 + 225

? = (270 / 3) + 225

? = 90 + 225 = 315

Hence, option B is correct.

5 » Explain it
C Hence, option C is correct.

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