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primary 5 | Maths

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Hi

Please help me with this question. Unable to get the answer with my working:

15R + 20H = 50 ---- [1]

Total amount of money Patrick = $U

15R + 20H + H = U + 0.9

50 + H = U + 0.9

U - H = 49.1 ---- [2]

R + 15R + 20H = U - 0.4

R + 50 = U - 0.4

U - R = 50.4 --- [3]

[3] - [2]

H - R = 1.30 --- [4]

[4] x 20

20H - 20R = 26 ---[5]

15R + 20H = 50 ---[1]

[1] - [5]

35R = 24

R = a long decimal number which is obviously wrong.

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