At the start of the road, a lamp post, a dust bin and a bench are placed together. Lamp post, dust bins and benches are placed at intervals of 70 m, 56 m and 84 m respectively along a stretch of road 8 km
long. Whenever the three objects are placed together, they will be painted blue.
(a) How far away from the start of the road is the second set of the 3 blue objects?
(b) How many lamp posts are there between every 2 sets of blue objects?
No

70 = 2*5*7
56 = 2*2*2*7
84 = 2*2*3*7
Least common multiple of 70,56,84 = 2*2*2*3*5*7 = 840

The second set of blues is 2*840 = 1680 meters from the start

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )

Idon’t even know the answer hehehehe