A website Maths Puzzle Numerical Ability

The Equation of two sides AB and AC of an isosceles triangle ABC are x+y=5 and 7x-y=3 respectively. What will be the equation of the side BC if area of the triangle ABC is 5 square units.

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A website Other Question

A, B, C, D, E went to apple farm to pluck apple, after plucking they said the below sentence. All members plucked different number of apples.
A : E has 27 points
B : I have 81 points
C : B has 61 points
D : A < B & C is false
E : C = 30 + D.
If points>50 then they always say true unless the points are perfect square.
If points<50 then they always say false unless the points are perfect cube.
i.
what points B has
a. 27 b. 61 c. 64 d. 81
ii.
who has more points
a. a b. b c. c d. d 24, 60, 120, 210, ?

A. 300 B. 336
C. 420 D. 525