mental maths-25 a

find the value of x: 3x + 4 = 6(x-1)+7

(a)  

find the value of c: 2(c-3) =5(2c+2)

(a)  

solve: 0.16(5* + 1)=0.4x + 0.16

(a)  

What is the number which when to 15 times of itself gives 208.

(a)  

A number is as much greater than 84 as it is less than 108. What is the number?

(a)