exam Maths Puzzle Numerical Ability

1=0.4x-0.6x-5

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exam Other Question

RICARDO IS 4 YEARS LESS THAN TWICE AS OLD AS HIS SISTER.
THE SUM OF THEIR AGES IS 20.

HOW OLD IS RICARDO? Hi. Can I have some help finishing this expression?

Find all solutions of the equation and express them in the form a + bi.

x^2 + 7x + 12 = 0