Quiz Discussion

An alloy contains the copper and aluminum in the ratio of 7 : 4 While making the weapons from this alloy, 12% of the alloy got destroyed. If there is 12 kg of aluminum in the weapon, then weight of the alloy required is :

• 1] 14.4 kg
• 2] 37.5 kg
• 3] 40 kg
• 4] 48 kg

In a factory there are three types of machine M1, M2 and M3 which produces 25%, 35% and 40% of the total products respectively. M1, M2 and M3 produces 2%, 4% and 5% defective products, respectively. what is the percentage of non-defective products ?

• 1] 89%
• 2] 97.1%
• 3] 96.1%
• 4] 86.1%
• 5] None of these

The price of the sugar rise by 25%. If a family wants to keep their expenses on sugar the same as earlier, the family will have to decrease its consumption of sugar by

• 1] 25%
• 2] 20%
• 3] 80%
• 4] 75%

The number which exceeds 16% of it by 42 is :

• 1]

  50

• 2]

  52

• 3]

  58

• 4]

  60

• 5]

  None Of These

A fraction in reduced form is such that when it is squared and then its numerator is reduced by 33 1/3 % and denominator is reduced to 20%, its result is twice the original fraction. The sum of numerator and denominator is:

• 1] 8
• 2] 13
• 3] 17
• 4] 15
• 5] None of these

80% of a smaller number is 4 less than 40% of a larger number. The larger number is 85 greater than the smaller one. The sum of these two number is

• 1] 325
• 2] 425
• 3] 235
• 4] 500

The ratio 5 : 4 expressed as a percent equals :

• 1]

  12.5 %

• 2]

  40 %

• 3]

  80 %

• 4]

  125 %

An ore contains 25% of an alloy that has 90% iron. Other than this, in the remaining 75% of the ore, there is no iron. How many kilograms of the ore are needed to obtain 60 kg of pure iron?

• 1] 250 kg
• 2] 275 kg
• 3] 300 kg
• 4] 266.66 kg

Vicky's salary is 75% more than Ashu's. Vicky got a raise of 40% on his salary while Ashu got a raise of 25% on his salary. By what percent is Vicky's salary more than Ashu's?

• 1] 96%
• 2] 51.1%
• 3] 90%
• 4] 52.1%

The average weight of a class of students is 67.5 kg. The weight of the class teacher is 25% more than the average weight of the class. The average weight of the class is less than the class teacher by x%. The value of x is:

• 1] 33.335
• 2] 25%
• 3] 20%
• 4] 22%