# There are three pumpkins.Each two of them are weighed in pairs and the final results are: #12# #"kg"#, #13# #"kg"#, #15# #"kg"#, What is the weight of the lightest pumpkin?

##
Please help......Thanks

Please help......Thanks

##### 1 Answer

The weight of the lightest pumpkin is

#### Explanation:

If we weigh pumpkin 1 (let's call it

Then solve for

Next, if we weigh pumpkin 1 (still calling it

Then solve for

Next, if we weigh pumpkin 2 (still calling it

But from above we know what

Substituting the value of

And substituting the value of