mr wong paid $128 for 7 calculator and 4 files. each calculator cos 4 times as much as a file. how much did he pay for a calculator ?.
B. inggris
sella178
Pertanyaan
mr wong paid $128 for 7 calculator and 4 files. each calculator cos 4 times as much as a file. how much did he pay for a calculator ?.
1 Jawaban
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1. Jawaban Merlia42
C = 4F
7C + 4F = 128 --> 7(4F) + 4F = 128 --> 28F + 4F = 128 --> 32F = 128 --> F = 128 : 32 = 4
C = 4F --> C = 4*4 = 16
so a calculator costs $16