exam Maths Puzzle Numerical Ability

Find the expected number of girls in a family of 7.

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exam Other Question

Solve the system of equation:

3x+2y=11
2x-2y=4

Solve the system:

2x-y+2z=11
3x-2y-z=12
x-3y-z=1 the perimeter of rectangle 240 cm. its length is decreased by 10% & its breadth increased by 20 we get the same perimeter find the length & breadth of rectangle