A factory can produce 280 radios in 4 days. At the same rate,

(a) How many radios can the factory produce in a week? radios

(b) If the factory receives an order of 3150 radios, how many days will be needed to fill the order? days

The number of radios each day: 280 ÷ 4 = 70

(a) The number of radios in a week: 70 × 7 = 490

(b) The days needed: 3150 ÷ 70 = 45