**Arithmetic Ability MCQ SET I**

**(1) 40 L of a mixture of milk and water contains 10% of water, the water to be added , to make the water content 20% in the new mixture is**

(a) 6 L

(b) 6.5 L

(c) 5.5 L

(d) 5 L

**(2) In an alloy, the ratio of copper and zinc is 5 : 2. If 1.250 kg of zinc is mixed in 17 kg 500 g of alloy, then the ratio of copper and zinc will be **

(a) 2:1

(b) 2:3

(c) 3:2

(d) 1:2

**(3) The length of a rectangle is decreased by 10 % and its breadth increased by 10%. By what per cent is its area changed ?**

(a) 100%

(b) 0%

(c) -1%

(d) 6%

**(4) A student multiplying a number by 3/5 instead of 5/3. What is percentage error in the calculation ?**

(a) 64%

(b) 34%

(c) 45%

(d) 54%

**(5) If the length of a rectangle is increased by 25% and the width is decreased by 20%, then the area of the rectangle **

(a) decrease by 10%

(b) increase by 5%

(c) remains unchanged

(d) decrease by 5 %

**(6) A trader marks his goods at 20% above the cost price. If he allows a discount of 5% on the marked price, what profit per cent does he make ?**

(a) 16%

(b) 19%

(c) 14%

(d) 17%

**(7) The square root of (272 ^{2} – 128^{2}) is**

(a) 144

(b) 8

(c) 256

(d) 240

**(8) A candidate who can gates 20% marks in an examination fails by 30 marks but another candidate who gets 32% gets 42 marks more than the pass mark. Then, the percentage of pass marks is**

(a) 36%

(b) 25%

(c) 54%

(d) 50%

**(9) A cistern of capacity 8000 L measures externally 3.3 m by 2.6 m by 1.1 m qnd its walls are 5 cm thich. Then thickness of the bottom is **

(a) 1.1 m

(b) 96 cm

(c) 1 dm

(d) 1 m