15 is 360
16 the first one is 60 and the second is 120
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➷ You can form this equation:
(call the unknown number x)
8x - 66 = 2x
Add 66 to both sides:
8x = 2x + 66
Subtract 2x from both sides:
6x = 66
Divide both sides by 6:
x = 11 <== this is the number
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You need to multiply the amount by the tax
3/10n = 4/5
n = (4/5)/(3/10)
n = 4/5 * 10/3
n = 8/3
n = 2 2/3