Let one of the positive numbers be x.
∴  The other will be 4x
Now, 4x × x = 2500
⇒  x² = 2500 ÷ 4 = 625
∴  x = 625 = 25
∴  Sum of the two numbers
= 5x = 5 × 25 =125

Correct Option: B

Let one of the positive numbers be x.
∴  The other will be 4x
Now, 4x × x = 2500
⇒  x² = 2500 ÷ 4 = 625
∴  x = 625 = 25
∴  Sum of the two numbers
= 5x = 5 × 25 =125

Let number of boys = x
and number of girls = 85 – x
According to the question,
x × 4 + (85 – x ) × 5 = 380
⇒  4x + 425 – 5x = 380
⇒  x = 45

Correct Option: D

Let number of boys = x
and number of girls = 85 – x
According to the question,
x × 4 + (85 – x ) × 5 = 380
⇒  4x + 425 – 5x = 380
⇒  x = 45

Correct Option: D

Expression =		99 +	1	+ 99 +	2	+ 99 +	3	+ .......+ 99 +	6
			7		7		7		7

= (99 ×6) +		1	+	2	+	3	+	4	+	5	+	6
		7		7		7		7		7		7

	= 594 +		1 + 2 + 3 + 4 + 5 + 6
			7

Let the numbers be x and y.
∴  x + y = 10 and xy = 24

Correct Option: B

Let the numbers be x and y.
∴  x + y = 10 and xy = 24

Let the numbers be x and y.
xy = 120
x² + y² = 289
(x − y)² = x² + y² − 2xy
= 289 – 2× 120 = 289 – 240 = 49
∴  x – y = 7

Correct Option: B

Let the numbers be x and y.
xy = 120
x² + y² = 289
(x − y)² = x² + y² − 2xy
= 289 – 2× 120 = 289 – 240 = 49
∴  x – y = 7