exam Maths Puzzle Numerical Ability

from a rectangular piece of paper of size 100 cm by 80 cm are cut four squares of side 10 cm from each corner the flaps are folded and an open box is formed find the surface area of box so formed.

Read Solution (Total 0)

exam Other Question

I am having trouble solving these systems. I get lost somewhere in the middle and it becomes a mess. Please help.
x-2y-3z=4
2x-4y+5z=-3
5x-6y+4z=-7

and

2x-y=-1
-2x+z=1
y-z=0

Thank you.
7x+-15 . (x+11)
__________________
11x +121