## evergirl 3 years ago Robert purchased \$2,000 worth of U.S. savings bonds. If bonds are sold in \$50 or \$100 denominations only, which of the following CANNOT be the number of U.S. savings bonds that Robert purchased?

1. sasogeek

...?

2. evergirl

I got 27

3. evergirl

4. sasogeek

you said, "...which of the following....", but there's no options? :/

5. evergirl

29 27 30 40 50

6. evergirl

there they r^^^^

7. sasogeek

how would u solve for 27 and 29?

8. evergirl

50x+100y=2000 x+2y=40 neither can be 29 neither can be 27 if x is 30 then y is 5 if x is 40 then he only bought \$50 bonds neither can be 50 dang! im confused now O.o

9. sasogeek

if it's 40, then he bought only \$50 bonds, hence \$50*40=\$2000 if it's 30, then he bought 10 \$100 bonds, and 20 \$50 bonds, hence 10*\$100 +20*\$50=\$1000+\$1000=\$2000 if it's 50, it's not possible, cos no matter the ratio, he will buy more than \$2000 worth of bonds i don't know how to go about 27 and 29

10. sasogeek

are you allowed to make multiple choices of answers or just 1?

11. evergirl

more than one

12. evergirl

so its 27 and 50?

13. evergirl

and 29?

14. sasogeek

that's what i would go for, i'm convinced those are the answers :) 27,29, and 50

15. evergirl

Thanks so much saso!!!!!

16. sasogeek

anytime :)