Three brothers wunmi, niyi and dare shared a quantity of walnuts in the ratio 3:4:5 if wunmi got 21 walnuts how many did niyi get? .​

28 walnuts

Step-by-step explanation:

3 times 7 is 21 so 4 times 7 is how many walnuts niyi gets

I've arranged the tiles into the correct positions, and wrote in the final result for each x and y.

The basic idea is to divide determinants as the vertical bars indicate (they aren't absolute value bars).

In each denominator is the determinant of the matrix which are the coefficients of the left hand side of each original equation given to you.

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The numerators are a slight variation of this matrix. The x determinant will have you replace the first column with 0 & 22 getting which helps figure out the x solution. The y solution is similar as well, but we replace the y column instead of the x column. So that explains the

After you have the proper determinants set up, you just evaluate each determinant using the formula

and then simplify the results.