" 8.If "a+2b+3c=20" and "2a+4b+c=25," then "

If a + 2b + 3c = 20 and 2a + 4b + c = 25 , then c = ______

(i) If 3A = 4B = 6C , find : A : B : C . (ii) If 2a = 3b and 4b = 5c , find: a : c .

If a : 5 = b : 2 = 2c : 25 , " then " 20% " of " a = 50% of b = __________ % of c .

If a+b+c=0 and a^2+b^2+c^2=1, then (a) a b+b c+c a=1/2 (b) a b+b c+c a=-1/2 (c) a^4+b^4+c^4=1/2 (d) a^4+b^4+c^4=3/2

If a+b=5 and 3a+2b=20, then (3a+b) will be: (a)10 (b) 15 (c) 20 (d) 25

If (a-b)=4 and ab=2, then (a^(2)+b^(2))=?( a) 18(b)20(c)25 (d) None of these

If A = {1,2,4}, B= {2,4,5}, C= {2,5}, then (A-B) xx(B-C)=

If A = {1,2,4}, B= {2,4,5}, C= {2,5}, then (A-B) xx(B-C)=

Write down the coefficients of a ,\ a b\ and \ a b c in the term 4a^4b^2c of the algebraic expression 4a^4b^2c-3a^3b^2c+3/2a b^3c^2dot