NTPC Graduate Tier 1

2016

Shift 2

Algebra 2

All Questions 2 Linear Equations 1 Quadratic Equations 1

Arithmetic 13

All Questions 13 Boats and Streams 1 Compound Interest 1 Linear Equations 1 Profit, Loss and Discount 3 Ratio & Proportion 2 Ratio and Proportion (Ages) 1 Simple and Compound Interest 1 Time and Work 2 Time, Speed and Distance 1

Art and Culture 2

All Questions 2 Folk Dances 1 National Symbols 1

Biology 5

All Questions 5 Animal Kingdom 1 Human Diseases 1 Human Physiology 2 Medical Discoveries 1

Chemistry 2

All Questions 2 Everyday Chemistry 1 Periodic Table 1

Computer Awareness 3

All Questions 3 Computer Fundamentals 1 Operating Systems 1 Software 1

Current Affairs 2

All Questions 2 International Events 1 International Leaders 1

Data Interpretation 3

All Questions 3 Tabular DI 3

Environment & Ecology 2

All Questions 2 Pollution 2

Geography 2

All Questions 2 Economic Geography 1 Physical Geography 1

Geometry & Trigonometry 4

All Questions 4 Geometry 3 Heights and Distances 1

History 6

All Questions 6 Ancient History 1 Medieval History 2 Modern History 2 World History 1

Mensuration 1

All Questions 1 3D Figures 1

Number System 7

All Questions 7 Decimals & Fractions 1 Divisibility Rules 1 Fractions 2 HCF & LCM 2 Simplification 1

Physics 2

All Questions 2 Electricity 1 Light and Optics 1

Polity 2

All Questions 2 Constitutional Framework 1 Fundamental Rights 1

Reasoning 27

All Questions 27 Analogy 3 Blood Relations 3 Classification 1 Coding Decoding 4 Mathematical Operations 4 Seating Arrangement 3 Syllogism 2 Syllogism / Logic 3 Venn Diagrams 3 Verbal Reasoning 1

Science 5

All Questions 5 Physics 1 Scientific Discoveries 1 Scientific Inventions 1 Space Technology 2

Static GK 7

All Questions 7 Awards and Honours 1 Famous Personalities 1 Sports 4 World Firsts 1

Statistics 3

All Questions 3 Mean, Median, Mode 3

Arithmetic

Linear Equations

EN हिंदी

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NTPC Graduate Tier 1 2016 Shift 2 📅 02 Apr, 2016

There are 90 coins, comprising of 5 and 10 paisa coins. The value of all the coins is Rs. 7. How many 5 paisa coins are there?

A

50

B

45

C

40

D

35

Result Summary

APEDIA

NTPC Graduate Tier 1

2016 • 02 Apr, 2016 • Shift 2

There are 90 coins, comprising of 5 and 10 paisa coins. The value of all the coins is Rs. 7. How many 5 paisa coins are there?

Correct Answer

40

Setting up Variables: Let the number of 5 paisa coins be denoted as 'x', and the number of 10 paisa coins be 'y'. The total physical coin count gives us Equatio......

💡 Analysis & Explanation

Setting up Variables ▼

Let the number of 5 paisa coins be denoted as 'x', and the number of 10 paisa coins be 'y'. The total physical coin count gives us Equation 1: x + y = 90.

Value Conversion ▼

Convert the total rupee value into paisa to maintain consistent units. Rs. 7 equals 700 paisa.

Formulating the Value Equation ▼

The total monetary value gives us Equation 2: 5x + 10y = 700.

Substitution Method ▼

From Eq 1, we know y = 90 - x. Substituting this into Eq 2 results in: 5x + 10(90 - x) = 700.

Solving for x ▼

Expanding it gives 5x + 900 - 10x = 700. This simplifies to -5x = -200, which further reduces to x = 40.

Conclusion ▼

The exact number of 5 paisa coins is 40.