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Assertion (A) and Reason (R) both are correct and Reason (R) correctly explains Assertion (A). Sodium metal is preserved in 'Kerosene Oil' because Sodium becomes very reactive in air.
25% of 300 + √(?) = 35% of 600 - 15% of 300
(√1024 + √324)% of 780 = ?% of 260
(8.6 × 8.6 + 4.8 × 4.8 + 17.2 × 4.8) ÷ (8.62 – 4.82 ) = ? ÷ 19
√289 + √49 + 121 =?
[490 of 7 - (13)2 of 5] - 1228 = ?
25% of (?) + (1/4)of 5600 = 2500 – 20% of 1940
14 × 6 + 9 × 11 = (82 – 3) × ?
63 × 4 = ?2 – 1620 ÷ 5