exam Maths Puzzle Numerical Ability

dick is now 7 times as old as harry. in six years dick will be five times as old as harry. how old will harry be in 5 years ?

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exam Other Question

b+4b=-90 I need some help, please.
Determine the nature of the solutions of the equation:
9t^2-7t=0
a. 2 real solutions, b. 1 real solution, c. 2 imaginary solutions