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

If a-b=3 and a^(2)+b^(2)=29, find the value of ab. (a) 10 (b) 12 (c) 15 (d) 18

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

If a + b =8, a -b =4, then a^2 + b^2 is equal to (A) 20 (B) 40 (C ) 10 (D) 30

If (a)/(b)=(4)/(3), then (3a+2b)/(3a-2b)=?( a) -1 (b) 3 (c) 5(d)6

If a : b=5:7 a n d c : d=2a :3b , t h e n a c : b d is 10 : 21 b. 20 : 38 c. 50 : 147 d. 50 : 151

If a and b be positive integers such that a^2-b^2=19 , then the value of a is 9 (b) 10 (c) 19 (d) 20

If A B C D E F such that D E=3c m , E F=2c m , D F=2. 5 c m , B C=4c m , then perimeter of A B C is (a) 18cm (b) 20cm (c) 12cm (d) 15cm

If a^(3)+b^(3)=20 and a+b=5 then find a^4+b^4

If 25 a+25 b=115 , what is the average of a and b ? (a) 2.5 (b) 3.4 (c) 4.5 (d) 4.6 (e) None of these

If a:b=2:5, then (3a+2b)/(4a+b)=(16)/(13)( b) (13)/(16)(25)/(22)(d)(20)/(21)