The answer of the above equation is 43.
Explaination:
Let the shoes be, S
the boy be, B
& Let the Tie be, T
So, rearranging the equations in the terms of S, B, & T.
Equation (1); 2S + 2S + 2S = 30
Equation (2); B + B + 2S = 20
Equation (3); 2T + 2T + B = 13
Equation (4); S + (B+2T+2S) * T =?
Solving equation (1);
2S + 2S + 2S = 30
6S = 30
S = 5
Substitute the value of S, in equation (2);
B + B + 2S = 20
2B + 2(5) = 20
2B = 10
B = 5
Now, substitute the value of B, in equation (3);
2T + 2T + B = 13
4T = 13 – 5
4T = 8
T = 2
Now, substitute the values in equation (4);
S + (B+2T+2S) * T =?
= 5 + (5 + 4 + 10) * 2
= 5 + 19 * 2
S + (B+2T+2S) * T= 5 + 38
S + (B+2T+2S) * T = 43
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