exam Maths Puzzle Numerical Ability

How do I solve by using two equations and two variables?

The sum of the digits of a two-digit number is 12. If 15 is added to the number, the result is 6 times the units digit. Find the number.

Read Solution (Total 0)

exam Other Question

simplify. assume all variables represent positive numbers

sqrt(x^4y^3)
Hi, I am hoping someone can help me with this equation:

Let f(x) = 2x+5 and find a) f^-1 and b) 1/f(x)