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505-555 (Easy)|   Word Problems|                                          
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At a bakery, all donuts are priced equally and all bagels 02 Mar 2026, 08:15
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At a bakery, all donuts are priced equally and all bagels are priced equally. What is the total price of 5 donuts and 3 bagels at the bakery?

(1) At the bakery, the total price of 10 donuts and 6 bagels is $12.90.
(2) At the bakery, the price of a donut is $0.15 less than the price of a bagel.
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At a bakery, all donuts are priced equally and all bagels 03 Aug 2026, 00:47
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A because 10D+6B=12.9 => 5D+3B=6.0495
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At a bakery, all donuts are priced equally and all bagels 03 Aug 2026, 12:03
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the easiest way is to divide the equation by 2,
10 donouts+6bagels=12.90

divide it by 2 we get the answer..

5donouts+6 bagels=6.45. Option A
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At a bakery, all donuts are priced equally and all bagels 16 Aug 2026, 09:48
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1) 10d + 5b = 12.90
2) d = b - 0.15
10(b-0.15)+6b=12.90
10b-1.5+6b=12.90
16b=14.4
b=0.9
[substitute for b in 2nd equation]
d=0.9-0.15=0.75
5(0.75)+3(0.9)=6.45, which is equal to 12.90(0.5)
JaredL
At a bakery, all donuts are priced equally and all bagels are priced equally. What is the total price of 5 donuts and 3 bagels at the bakery?

(1) At the bakery, the total price of 10 donuts and 6 bagels is $12.90

(2) At the bakery, the price of a donut is $0.15 less than the price of a bagel.


I understand 1) is sufficient. But I'm not understanding why 2) is insufficient. If you let price of donut be x, then price of bagel is x+0.15. Therefore 10x + 6(x + 0.15) = 12.90. Solve that and get a value for x and obviously x + 0.15.

Am I missing something obvious?
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