1). 152). 253). 54). 10

Answer»

According to the BODMAS rule, the priority in which the operations should be done is:

⇒ 21.003 × 39.998 – 209.91 = 126 × (?)

APPROXIMATING the values to the nearest integer:

⇒ 21 × 40 – 210 = 126 × (?)

⇒ 840 - 210 = 126 × (?)

(?) = 630/126

(?) = 5 (approx.)

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