Answer:
$210
Step-by-step explanation:
X - the amount of money given by Jacqui
Y - the amount of money given by Joan
1. Jacqui gave three times as much as Joan so:
X = 3 * Y
2. Together they gave $280 so:
X + Y = $280
3. Now we replace X by 3 * Y then:
3 * Y + Y = $280
4 * Y = $280
Y = $70 - now we know how much Joan donated
4. Jacqui donated three times as much so we just multiply it:
X = $70 * 3
X = $210 - this is the final value
