Directions (1-10): What will come in place of the question mark (?) in the following question ?
नीचे दिए गए प्रश्नों में प्रश्नवाचक चिन्ह (?) के स्थान पर क्या आना चाहिए?
Q1. 250 का 14% × 150 का ?% = 840
(a)15
(b)18
(c)16
(d) 12
Q4. 28.314 – 31.4272 + 113.92 = ? + 29.113
(a) 82.711
(b) 80.701
(c) 71.711
(d) 81.6938
Q6. 8899 – 6644 – 3322 = ? – 1122
(a) 55
(b) 65
(c) 75
(d) 85
Q7. (46)² – (?)² = 4398 – 3066
(a) 16
(b) 28
(c) 36
(d) 42
Q8. (800 ÷ 64) × (1296 ÷ 36) = ?
(a) 420
(b) 450
(c) 500
(d) 540
Q9. (24 + 25 + 26)² – (10 + 20 + 25)² = ?
(a) 2520
(b) 2500
(c) 2600
(d) 2400
Q10. 397 × 397 + 104 × 104 + 2 × 397 × 104 = ?
(a) 250001
(b) 251001
(c) 260101
(d) 241001
Solutions:
S6.Ans(a)
Sol.
? = (8899 + 1122) – (6644 + 3322)
= 10021 – 9966
= 55
S7.Ans(b)
Sol.
?² = 46² – 1332 = 2116 – 1332
?² = 784
? = ±28
S9.Ans(c)
Sol.
? = 75² – 55²
= 20 × 130
= 2600
S10.Ans(b)
Sol.
? = (397) ² + (104) ² + 2 × 104 × 397
As we know,
(a + b) ² = a² + b² + 2ab
∴ ? = (397 + 104) ²
= (501) ²
= 2,51,001
