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Let the Number of boys and Girls who appeared in exam be x and y respectively, So, according to question- Number of boys passed in exam = [(100 - 20) × x]/100 = 0.80x Number of girls passed in exam = [(100 - 15) × y]/100 = 0.85y Condition (1) - ⇒ 0.80x = 0.85y + 70 ⇒ 0.80x - 0.85y = 70 ...(i) Condition (2) - Total failed students = 90 ⇒ 0.20x + 0.15y = 90 ...(ii) From eqn (1) - [4 × eqn (ii)] ⇒ (-0.85y) - 0.60y = 70 - 360 ⇒ 1.45y = 290 ⇒ y = 200 Put this value in eqn (i) ⇒ 0.80x = 0.85 × 200 + 70 ⇒ 0.80x = 170 + 70 = 240 ⇒ x = 300 So, total number of students appeared in exam = 300 + 200 = 500.
I f a mirror is placed on the line MN, then which of the answer figures is the correct image of the question figure?
Select the correct mirror image of the given figure when the mirror is placed to the right side of the figure.
Which of the answer figures is exactly the mirror image of the given figure when the mirror is held at AB?
If a mirror is placed on the line MN then which of the answer figure is the right image of the given figure?
Select the correct mirror image of the given figure when the mirror is placed on the right side of the figure.
If a mirror is placed on the line PQ, then out of the option figures which figure will be the mirror image of the question figure?
Select the correct mirror image of the given combination when the mirror is placed at ‘MN’ as shown.
