Ratio And Proportion Pdf Model Questions & Answers, Practice Test for ibps po prelims 2024 2025

Answer: (d)

Answer: (d)

Let the number of boys and girls are 7x and 5x, respectively.

According to question,

⇒7x + 5x = 2400⇒12x = 2400

∴ x = 200

∴ Number of girls = 5x

= 5 × 200 = 1000

Answer: (a)

Let the fixed amount be Rs x and the cost of each unit be Rs y. Then,

540y + x = 1800 ... (i) and

620 y+ x = 2040 ... (ii)

On subtracting (i) from (ii), we get

80y = 240⇒y = 3.

Putting y = 3 in (i), we get:

x = (1800 – 1620) = 180.

∴ Fixed charges = Rs 180, Charge per unit = Rs 3.

Total charges for consuming 500 units

= Rs (180 + 500 × 3) = Rs 1680.

Answer: (b)

Let the required number of days be x.

Number of cows ∝ $1/{\text"number of days"}$ (Indirect Proportion)

Number of bags ∝ number of days (Direct Proportion)

∴ = 1 × 40 × x = 40 × 1 × 40⇒x = 40.

Alternate method :

Let the required days be x

${40 × 40}/{1 × x} = {40}/{1} ⇒ x=40days$

Answer: (b)

Total age of 3 boys = (25 × 3) years = 75 years

Ratio of their ages = 3 : 5 : 7.

Age of the youngest boy = $(75 × {3/{15}})$ years = 15 years