7. Find a and b, such that 12, a+b, 2a, b are in AP
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A. P
2nd -1st term = 3rd -2nd term= 4th - 3rd = d
a+b-12= 2a-(a+b) = b-2a
a+b -12 __(1)=[a-b =b-2a]
a+2a=b+b
3a=2b
a= 2b/3
Put in eq" (1)
2b/3+b = 12
5b/3= 12
5b= 36
b=36/5
b= 7
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