What is the least number to be added to 1500 to make it a perfect square ?
(a) 21 (b) 35 (c) 43 (d) 59 (e) None of these
1 Answers
Talk Doctor Online in Bissoy App
A positive number is 5times another number. If 21 is added to both the numbers, the none of the new numbers becomes twice the other new number.
Let one of the number be x second number be 5x 2(x+21)=(5x+21) => 2x+42=5x+21 => 2x−5x=21−42 => −3x=−21 x=7 One of the number 7 Second number 7×5=35 Answer : 7,35
1 Answers 1 views
What is the least number to be added to 1500 to make it a perfect square? (a) 20 (b) 21 (c) 22 (d) 23 (e) None of these
(b) 382 = 1444 392 = 1521 Required number = 1521 – 1500 = 21
1 Answers 1 views
If (26)^2 is subtracted from square of a number, the answer so obtained is 549. What is the number? (a) 35 (b) 33 (c) 29 (d) 41 (e) None of these
(a) Let the the number be = x According o the question, x2 – 262 = 549 or, x2 – 676 = 549 or, x2 = 549 + 676 = 1225 or, x = √1225...
1 Answers 1 views
If (61)^2 is added to the square of a number, the answer so obtained is 5242. What is the number? (a) 40 (b) 39 (c) 37 (d) 43 (e) None of these
(b) Let the number be x. x2 + 612 = 5242 x2 = 5242 – 3721 = 1521 x = 39
1 Answers 1 views
What is the least number to be added to 4400 to make it a perfect square? (a) 87 (b) 91 (c) 93 (d) 89 (e) None of these
(d) √4400 = 66.33 Required number = 672 – 4400 = 4489 – 4400 = 89
1 Answers 3 views
What is the least number to be added to 4700 to make it a perfect square?
d) 69 × 69 = 4761 68 × 68 = 4624 Clearly, 4624 < 4700 < 4761 Hence, 61 should be added to 4700 to make it a perfect square.
1 Answers 1 views
What is the least number to be added to 3986 to make it a perfect square? (a) 188 (b) 95 (c) 110 (d) 100 (e) 5224
(c) √3986 = 63.13 The next higher square is (64)2 = 4096 number to be added = 4096 – 3986 =110
1 Answers 3 views
56% of a number is 1064. What is 38% of that number ? (a) 666 (b) 722 (c) 856 (d) 912 (e) None of these
(b) 722 Let number be x 56% of a number = 1064 \(\frac{56}{100} \times x = 1064\) \(x = 1064 \times \frac{100}{56}\) x = 1900 ∴ number = 1900 38% of a number = 38% of 1900 = \(1900...
1 Answers 7 views
40% of 15% of 3/4th of a number is 153. What is the number? (a) 3400 (b) 3650 (c) 3600 (d) 3200 (e) None of these
(a) Let the number be = x x = (153x4x100x100)/(3x15x40)= 3400
1 Answers 1 views
One-eighth of a number is 17.25. What will 73% of the number be ? (a) 100.74 (b) 138.00 (c) 96.42 (d) 82.66 (e) None of these
(a) Let the number be = x According to the question, x/8 = 17.25 or x = 17.25 x 8 = 138 73% of 138 = 138 x 73/100= 100.74
1 Answers 1 views