simplification Model Questions & Answers, Practice Test for ibps so prelims 2023

Question :26

What is the least number to be added to 1500 to make it a perfect square ?

Answer: (c)

$39^2 = 1521 ; 38^2$ = 1444

$38^2 < 1500 < 39^2$

∴ To make1500 a perfect square, 21 should be added to it.

Question :27

561 ÷ 35.05 × 19.99 = ?

Answer: (c)

${561}/{35}$ × 20 = 320.5 ≈ 320

Question :28

$(27)^{7.5} × (729)^{1.75} ÷ (19683)^{-2} ÷ {1/{(19683)^{-5}} = (27)^{?}$

Answer: (c)

$(27)^{7.5} × (27)^{3.5} ÷ (27)^{–6} ÷ (27)^{15}$

= $(27)^{7.5 + 3.5 + 6 – 15} = (27)^{17 – 15} = (27)^2$

∴ ? = 2

Question :29

9.1 × 7.5 × 6.2 = ?

Answer: (c)

? = 9.1 × 7.5 × 6.2

= 423.15

Question :30

$(10)^{24} × (10)^{–21}$ = ?

Answer: (d)

? =$(10)^{24} × (10)^{–21}$

= $(10)^{24–21} = 10^{3}$ = 1000

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