units digit

[ddm]

attachment

[Sunny22uk]

since X3 x 3 = 2y x 9
it follow that x3=2y x 3 ( divide both sides by 3)
since x and y are between 1 and 10, it folllows that y=1(units digit has to be equal on the right hand side and left hand side)
Right hand side= 63
x=6,y=1, answer=7

[ddm]

"it folllows that y=1(units digit has to be equal on the right hand side and left hand side)"???

How did u get that?

[Sunny22uk]

since X3 x 3 = 2y x 9
it follow that x3=2y x 3 ( divide both sides by 3)
since x and y are between 1 and 10, it folllows that y=1(units digit has to be equal on the right hand side and left hand side)
Right hand side= 63
x=6,y=1, answer=7

>>the units digit on the left hand side is 3
>>the units digit on the right hand side must be 3(for the two numbers to be equal)
>>Units digit of 2yx3 means yx3
>>for yx3 to be equal to 3 and y being between 1 and 10, y=1 is the only value which will give the desire result

Let me know if you have any questions