मान ज्ञात कीजिए: 378 × 456

There are five spools of thread in white, black, red, green, and blue colors. Each spool measures 87.50 m. If thread used is: white = 43.25 m, red = 38.62 m, black = 71.98 m, green = 21.04 m, and blue = 29.74 m, find the balance thread remaining in all five spools together.

A government office uses 4 reams of paper daily. How many reams in total will they use in 7 days?