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1. m – (m – 1)/2 = 1 – (m – 2)/3 m – (m – 1)/2 = 1 – (m – 2)/3 ⇒ m – m/2 – 1/2 = 1 – (m/3 – 2/3) ⇒ m – m/2 + 1/2 = 1 – m/3 + 2/3 ⇒ m – m/2 + m...

1. x/2 – 1/5 = x/3 + 1/4 x/2 – 1/5 = x/3 + 1/4 ⇒ x/2 – x/3 = 1/4 + 1/5 ⇒ (3x – 2x)/6 = (5 + 4)/20 ⇒ 3x – 2x = 9/20 × 6 ⇒ x = 54/20 ⇒ x = 2...

Let the age of Aman’s son be x then age of Aman will be 3x. According to the question, 5(x – 10) = 3x – 10 ⇒ 5x – 50 = 3x – 10 ⇒ 5x – 3x = -10...

Let the age of granddaughter be x and grandfather be 10x. Also, he is 54 years older than her. According to the question, 10x = x + 54 ⇒ 10x – x...

Let the total number of deer be x. Deer grazing in the field = x/2 Deer playing nearby = x/2 × 3/4 = 3x/8 Deer drinking water = 9 According to...

Let 2x m of trouser material and 3x m of shirt material be bought by him Selling price of shirt material per meter = Rs 50 + 50 ×(12/100) = Rs 56...

Let the length of the rectangular plot be 11x and breadth be 4x. Rate of fencing per metre = ₹100 Total cost of fencing = ₹75000 Perimeter of th...

Let the present age of Shobo be x then age of her mother will be 6x. Shobo’s age after 5 years = x + 5 According to the question, (x + 5) = (1/3...

Let the digit at tens place be x then digit at ones place will be 3x. Original two-digit number = 10x + 3x After interchanging the digits, the new...

Let the digit at tens place be x then digit at ones place will be (9-x). Original two-digit number = 10x + (9-x) After interchanging the digits, t...

Let one of the positive number be x then other number will be 5x. According to the question, 5x + 21 = 2(x + 21) ⇒ 5x + 21 = 2x + 42 ⇒ 5x – 2...

Let the number be x, According to the question, (x – ) × 8 = 3x ⇒ 8x – = 3x ⇒ 8x – 3x = ⇒ 5x = 20 ⇒ x = 4 Thus, the number is 4.

1. 8x + 4 = 3 (x – 1) + 7 8x + 4 = 3 (x – 1) + 7 ⇒ 8x + 4 = 3x – 3 + 7 ⇒ 8x + 4 = 3x + 4 ⇒ 8x – 3x = 4 – 4 ⇒ 5x = 0 ⇒ x = 0 Putting the ...

1. 3x = 2x + 18 3x = 2x + 18 ⇒ 3x – 2x = 18 ⇒ x = 18 Putting the value of x in RHS and LHS we get, 3 × 18 = (2 × 18) +18 ⇒ 54 = 54 ⇒ LH...

Correct answer: (3) cephalopoda

Correct answer: (2) Asteroidea

Correct answer: (4) metanephros

Correct answer: (4) Platypus

Correct answer: (2) ascon type

(3) Mature proglottides contain both male and female organs