Let their present ages be x and y. Then x – 5 = 3(y – 5) and x + 10 = 2(y + 10). Simplifying yields x – 3y = -10 and x – 2y = 10. Solving gives y ...
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Yes, it holds in both cases. (i) The Midpoint Theorem on triangles formed by diagonals still ensures opposite sides are parallel and equal to half the diagonal. (ii) It degenerates into a segment when diagonal AC is parallel to BD ...
Multiply each student’s family average age by their family size to find total family years. Sum these values and divide by total members across all families for the combined mean. Class 9 maths Chapter 10 How Quantities Combine Understanding Data solutions
The given slope ratio is 1 / 12. For a total vertical height of 18 cm, the horizontal length must be 18 × 12 = 216 cm, which equals 2.16 metres. Cbse released Class 9 Ganita Manjari Part 2 book Chapter ...
Slope equals vertical rise divided by horizontal run. Substituting the given values gives slope = 2.5 / 4 = 5 / 8 = 0.625. Thus, the slope of the loading ramp is 0.625. Class 9 Ganita Manjari Part 2 chapter 13 ...