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Rs aggarwal solutions

CHAPTERS

9. Linear Equations in One Variable

10. Ratio, Proportion and Unitary Method.

11. Line Segment, Ray and Line

13. Angles and Their Measurement

14. Constructions (Using a Ruler and a pair of Compasses)

18. Three – Dimensional Shapes

19. Two-Dimensional Reflection Symmetry (Linear Symmetry)

4.5 g of an alloy of copper and zinc contains 3.5 g of copper. What weight of copper will there be in 18.9 g of the alloy?

Given 4.5 g of an alloy of copper and zinc contains 3.5 g of copper

For 1 g of an alloy will contain = 3.5 / 4.5

= 0.777 g of copper

1 g of an alloy will contain 0.777 g of copper

For 18.9 g of an alloy contain = 0.777 × 18.9

= 14.7 g of copper

**Hence, 18.9 g of an alloy contains 14.7 g of copper**

Given 4.5 g of an alloy of copper and zinc contains 3.5 g of copper

For 1 g of an alloy will contain = 3.5 / 4.5

= 0.777 g of copper

1 g of an alloy will contain 0.777 g of copper

For 18.9 g of an alloy contain = 0.777 × 18.9

= 14.7 g of copper

**Hence, 18.9 g of an alloy contains 14.7 g of copper**

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