If 3a - 5c= 5 and 6ab +10bc- 15 ac = 14 find the value of 27a3 +125c3

1.	If 3a - 5c= 5 and 6ab +10bc- 15 ac = 14 find the value of 27a3 +125c3 + 90abc = 86
Answer» First add all the terms 3a -5c +6ab+10bc- 15ac =14 +5 which gives 19 on cubing both sides 27a3 + 125c3 + 90+90 = 86 which gives 27a3 +6ab + 10bc-15ac -90abc=86-180 = -94

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