Question

a] {[(27a-79)x61-78]x15+340}:250=4
b] 10x{a-10x[362+10x(24+24:4)]}=100
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Answer 1

{[(27a-79)x61-78]x15+340}:250=4  | x250
[(27a-79)x61-78]x15+340=1000  |-340
[(27a-79)x61-78]x15=660    | :15
(27a-79)x61-78=44    | +78
(27a-79)x61=122    |:61
27a-79=2    |+79
27a=81    |:27
a=3

10x{a-10x[362+10x(24+24:4)]}=100  |:10
a-10x[362+10x(24+6)]=10
a-10x(362+10x30)=10
a-10x(362+300)=10
a-10x662=10
a-6620=10
a=6620+10
a=6630