EASY
Civil Services Preliminary Examination Paper 2
IMPORTANT
Earn 100

The average weekly salary per head of all employees (supervisors and labourers) is 100 . The averagelweekly sa lary per head of all the supervisors is 600 while the average weekly salary per head of all the labourers is  75 . Find the number of supervisors in the factory if there are 840 labourers in it.

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Important Questions on Basic Numeracy

EASY
Civil Services Preliminary Examination Paper 2
IMPORTANT
Two alloys A and B contain silver and copper in the ratio 5 : 1 and 7 : 2, respectively. Find the ratio in which they be mixed such that there be 80% of silver.
EASY
Civil Services Preliminary Examination Paper 2
IMPORTANT
A tea producer mixes two categories of tea from two gardens is the ratio 5 : 3. The cost price of one category is 27 per kg and that of other is ₹ 30 per kg. The mixture is sold at ₹ 30.25 per kg. Find his gain per cent.
MEDIUM
Civil Services Preliminary Examination Paper 2
IMPORTANT
The wheat sold by a shopkeeper contained 10% low-quality wheat. What quantity of good quality wheat should be added to 150 kg of wheat so that percentage of low-quality wheat becomes 5%
MEDIUM
Civil Services Preliminary Examination Paper 2
IMPORTANT
Padam purchased 30 kg of rice at rate of  Rs.17.50 per kg and another 30 kg rice at a certain rate. He mixed the two and sold the entire quantity at the rate of Rs.18.60 per kg and made 20% overall profit. At what rate did he purchase the lot of another 30 kg rice?
MEDIUM
Civil Services Preliminary Examination Paper 2
IMPORTANT
A painter mixes blue paint with white paint so that the mixture contains 10% blue paint. In a mixture of 40 litres paint, how many litres blue paint should be added so that the mixture contains 20% of blue paint?
MEDIUM
Civil Services Preliminary Examination Paper 2
IMPORTANT
A lump of copper and brass weights 24 kg and is worth  30.50. If the proportion of copper and brass be interchanged, the lump would be worth 33.50. If 2 kg of copper and 3 kg of brass costs ₹ 6. 75, find the cost of copper per kg.
MEDIUM
Civil Services Preliminary Examination Paper 2
IMPORTANT
Five litres are drawn from a vessel full of water and substituted by pure milk. Again, 5 L of the mixture are drawn and substituted by pure milk. If the vessel now contains water and milk in the ratio 9 : 16, find the capacity of the vessel.
MEDIUM
Civil Services Preliminary Examination Paper 2
IMPORTANT
Three glasses of sizes 3 litres, 4 litres and 5 litres contain mixture of milk and water in the ratio of 2 : 3, 3 : 7 and 4 : 11 respectively. The contents of all the three glasses are poured into single vessel. Find the ratio of milk to water in the resultant mixture ?