Question

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Answer 1

i am pretty good with it

Answer 2

i thnk i see what you mean. like this?

Answer 3

1/2 (ab-cd) = 60

Answer 4

how do you know ac and bd = 106?

Answer 5

Well
1/2 (ab-cd) = 60
that means
ab-cd = 120

Answer 6

so ab + cd = 148
and ab - cd = 120

Answer 7

maybe use substitution or combination property?

Answer 8

like combo
2ab = 148 + 120
2ab = 268
ab = 1/2 x 268
ab = 134

Answer 9

which means
134 + cd = 148
cd = 148 - 134
cd = 14

Answer 10

It was no problem :)