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 By: grace0306 (offline)  Monday, February 20 2012 @ 09:47 PM CST (Read 882 times)
grace0306

1 watermelon and 1 mango cost \$3.20. 1 papaya and 1 watermelon cost \$3.50. 1 mango and 1 papaya cost \$2.80. Find the total cost of 3 mangoes, 4 papayas and 5 watermelons. Thanks.

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Registered: 09/02/10
Posts: 3

 By: hci (offline)  Monday, February 20 2012 @ 11:47 PM CST
hci

1 W + 1M = \$3.20
1P + 1W = \$3.50
1M + 1P = \$2.80

So, 1P + 1W + 1M + 1P= \$3.50+\$2.80
2P + 1 W + 1M = \$6.30
Since from the above 1W + 1M =\$3.20, that means
2P + \$3.20 = \$6.30
therefore, 2P = \$6.30 - \$3.20
2P = \$3.10
1P = \$3.10 divide by 2 = \$1.55
Since 1P + 1W = \$3.50
hence, 1W =\$3.50-\$1.55
= \$1.95
Since 1M + 1P = \$2.80,
1M = \$2.80-\$1.55
=\$1.25
Cost of 3 mangoes, 4 papayas and 5 watermelons will be
3 x \$1.25 + 4 x \$1.55 +5 x \$1.95
=\$19.70

Hope it helps!

Newbie

Registered: 05/10/11
Posts: 3

 By: grace0306 (offline)  Tuesday, February 21 2012 @ 12:21 AM CST
grace0306

thanks!!

Newbie

Registered: 09/02/10
Posts: 3

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