randRangeUnique(1, 20, 2) shuffle([10, 100]) D1 === 10 ? N1 * 10 + N2 : N1 + N2 * 10

fraction(N1, D1) + fraction(N2, D2) = {?}

N1 / D1 + N2 / D2

The fractions must have the same denominator before you can add them.

Let's rewrite fraction(N1, D1) with a denominator of 100.

\dfrac{N1 \times 10}{D1 \times 10} = fraction(N1 * 10, D1 * 10)

Now we can add.

fraction(N1 * 10, D1 * 10) + fraction(N2, D2) = {?}

Let's rewrite fraction(N2, D2) with a denominator of 100.

\dfrac{N2 \times 10}{D2 \times 10} = fraction(N2 * 10, D2 * 10)

Now we can add.

fraction(N1, D1) + fraction(N2 * 10, D2 * 10) = {?}

= fraction(SOL_NUM, 100)