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A - 10 = 4R - 40
A = 4R - 30 .... (1)
A = 2R ... (2)
dari persamaan (1) dan (2), diperoleh :
4R - 30 = 2R
4R - 2R = 30
2R = 30
R = 15
berarti A = 2R = 2 (15) = 30
maka, umur Ako 10 tahun mendatang = 30 + 10 = 40 tahun
dan umur Riko 10 tahun mendatang = 15 + 10 = 25 tahun