Question

albrert thought of a number added 9 multiplied it by 4,took away 8 and divided by 6 to get an answer what was his starting number?​

Answer 1

Let initial number be x and answer he get be y.

{(x+9)4–8}/6=y

4x+36=6y+8

2x+14=3y

Hence there be many set of (x,y) which would satisfy it.

For example, x=1 then y=16/3

x=2 then y=6 and so on.

Answer 2

Prove that Sin 20 cos 70° tan 50. tan 2 cos 55° cosec 35°-2 tan 50 , 25 ° . tan 650 , tan 850