Priya has 76 coins all of 50p and 20p. find the the total money she has is 29
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let she has x coins of 50p and y coins of 20p. x+y=76. x=76-y
50*x+20*y=2900
50(76-y)+20*y=2900
3800-30*y=2900
900=30*y
y=900/30
y=30
x=76-30=46
50*x+20*y=2900
50(76-y)+20*y=2900
3800-30*y=2900
900=30*y
y=900/30
y=30
x=76-30=46
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