ratio and proportion mcq pdf Model Questions & Answers, Practice Test for ibps rrb so officer sclae 2 3 single exam 2024

Answer: (d)

Let B puts in x cows

Then amount paid by B = $3/2$ × amount paid by A

∴${80 × 7}/{x × 3} = {\text"Amount paid by A"/\text"Amount paid by B"}$

= ${\text"amount paid by A"/\text"3/2 × amount paid by A"}$

⇒x = ${80 × 7 × 3}/{3 × 2}$ = 280

Hence, B puts in 280 cows

Answer: (c)

Let B join after x months of the start of the business so that B's money is invested for (12–x) months.

∴ Profit ratio is 12 × 12500 : (12 – x) × 37500

or 12 : 3(12 – x)

Since profit is equally divided. therefore

12 = 3(12 – x) or x = 8. Thus B joined after 8 months.

Answer: (d)

The given solution has 50% alcohol. Water which is to be added has 0% alcohol concentration.

Alcohol concentration :

∴ Water should be added in the ratio 2 : 3

∴ Quantity of water to be added = $2/3$ × 9 = 6 ml

Alternate method:

Initialy the amount of after save in solution.

= 9 × ${50}/{100}$ = 4.5ml.

let x ml of water in mixed then.

(9 + x) ${30}/{100}$ = 4.5ml (remains same)

x = 6 ml

Answer: (c)

Let price of diamond be $kx^2$ where K is constant total price for 4 pieces

$Kx^2 [1 + 4 + 9 + 16] = 30 kx^2$

Price of original diamond = 100 $kx^2$

difference = $70kx^2 = 70000 or kx^2$ = 1000

original price

100 × 1000 = Rs.100000

Answer: (c)

Ratio of the salaries of Sumit and Rajan = $2/5 : 1/2$ = 4:5

Rajan's salary = $5/9$ × 36000 = Rs. 20000