3) Maurice has a pet hamster. In October he spent \( \$ 13.68 \) on hamster food \( \$ 7.89 \) on wood shavings \( \$ 21.14 \) on a new hamster wheel. About how much money did he spend on his hamster? Estimate by rounding each amount the nearest dollar. Exactly how much did he spend on his hamster in October?

Sebuah proyek dapat diselesaikan oleh 25 pekerja dalam waktu 30 hari. Setelah pekerjaan dikerjakan selama 12 hari, egiatan Proyek dihentikan selama 26 hari dan pemilik menginginkan pekerjaan selesai dalam waktu 50 hari. Banyaknya pekerja tambahan yang dibutuhkan adalah \( \begin{array}{ll}\text { (A) } 150 \text { orang. } & \text { (D) } 75 \text { orang. } \\ \text { (B) } 125 \text { orang. } & \text { (E) } 50 \text { orang. } \\ \text { (C) } 100 \text { orang. }\end{array} \)

Which is larger, 0.4 or 0.21?

2) The highest temperature ever recorded in the United States was \( 134^{\circ} \mathrm{F} \), measured in Death Valley, CA. The coldest temperature, \( -80^{\circ} \mathrm{F} \), was recorded in Prospect Creek, Alaska. What is the difference between these temperatures?

Write \( 45 \% \) as a fraction in lowest terms.

Express the ratio 15 to 20 as a fraction in lowest terms.